This Identification guide has been written to assist people in determining the authenticity of an Australian MK1 Morris Cooper S. For the MK2 Australian Cooper S, click here. The Australian MK1 variant of the Cooper S had a number of unique features when compared to other Mini models, and these are explained in detail below, including information with respect to correct engine and chassis number identification.
The MK1 Morris Cooper S had the largest production numbers of the Australian produced Cooper S cars, and is a highly desirable car in Australia and internationally, due to the unique and arguably improved features applied. Values of the Morris Cooper S have skyrocketed in recent years, and as a result, information regarding the accurate identity of these cars is essential, as they are closely related to the standard Minis of the same era, with many replicas produced. This guide provides a detailed outline, with associated images, to assist a prospective purchaser or owner in accurately identifying a vehicle.
Number produced: Approximately 4,986 MK1 Cooper S cars were produced. Approximately 7,500 Cooper S cars in Australia were produced in total (both MK1 and MK2).
Period of manufacture: September 1965 – April 1969. Note, there was partial overlap with MK2 production, and often components of both series cars may be seen on both around the changeover period. Where possible, these items have been detailed in this guide.
Please note, this guide has been written based on a variety of online sources and enthusiast input. You should not rely on this guide to make any purchasing decision and we make no representation that all information is accurate. You should always seek independent professional advice when looking to purchase a unique car. If you have additional information, photographs or corrections you believe need to be made to this page, please contact us by clicking the button at the top of this page, or comment below.
The Australian MK1 Cooper S had the following external features. Note, many features are shared with the standard Morris Mini, and MK2 Cooper S. This has been noted where appropriate.
The Australian Morris Cooper S MK1 had the following original interior features:
Interior colours and codes - MK1 Cooper S:
The following interior colours and associated codes are believed to be available on the Australian MK1 Cooper S. These colours were generally applied to the seats, door cards, dashboard backing trim and carpet. The roof lining was available in cream or black. Note, specific codes for these colours are yet to be confirmed. If you have any information, please contact us.
|Colour Name||Colour Code|
Seat trim pattern:
The MK1 Cooper S had two pattern designs, as described below and in the attached images:
Carpet types - MK1 Cooper S:
Our research suggests that carpet types varied on the MK1 Cooper S per the following points:
From our research, we have ascertained that the Australian Morris Cooper S MK1 was available in the following colours in the respective years, noting that many cars had a two tone paint scheme. Should you know of any additional colours, or have images of examples you can provide to us, please contact us so we can update this section. The original colour for a MK1 Morris Cooper S will be embossed in the ID plate, the location of which is demonstrated in the images.
|Colour Name||Colour Code||Colour Brand||MK1 Availability||Notes|
|Black||TBC||Dulon/Duco||1965 - 1969|
|British Racing Green||00036||Dulon/Duco||1965 - 1966|
|Burgundy / Burgundy Red||08999||Dulon/Duco||1966 - 1969|
|Castrol Racing Green||TBC||Dulon/Duco||1967||One off|
|Cedar Green||06543||Dulon/Duco||1965 - 1966|
|Clay Beige||10082||Dulon/Duco||1967 - 1968|
|Dream Blue||08444||Dulon/Duco||1965 - 1966|
|GTO Green||10238||Dulon/Duco||1968 - 1969|
|Indigo Blue||10084||Dulon/Duco||1967 - 1969|
|Jay Blue||10085||Dulon/Duco||1967 - 1968|
|Kelp Beige||10087||Dulon/Duco||1967 - 1968|
|Lake Green||10083||Dulon/Duco||1967 - 1969|
|Malmo Green||10081||Dulon/Duco||1967 - 1968|
|Marine Blue||08449||Dulon/Duco||1965 - 1967|
|Neutral Grey||08450||Dulon/Duco||1965 - 1967|
|New Cedar Green||01322||Dulon/Duco||1966|
|Nurburg White||02191||Dulon/Duco||1965 - 1966|
|Sand Beige||07187||Dulon/Duco||1965 - 1966|
|Sandown Red||10886||Dulon/Duco||1968 - 1969|
|Sapphire Blue||10245||Dulon/Duco||1968 - 1969|
|Seamist Green||01212||Dulon/Duco||1966 - 1967|
|Shadow Blue||05044||Dulon/Duco||1966 - 1967|
|Sierra Beige||10875||Dulon/Duco||1968 - 1969|
|Sky Blue||09921||Dulon/Duco||1965 - 1966|
|Snow White||10080||Dulon/Duco||1967 - 1969|
|Special Burgundy||10086||Dulon/Duco||1966 - 1969|
|Toga White||08452||Dulon/Duco||1965 - 1968|
The correct chassis number prefix on an Australian MK1 Cooper S is YKG2S2. This number should be embossed on the aluminium ID tag / chassis plate, next to the heading "TYPE". The chassis plate is located on the driver's side firewall / bulkhead, as shown in the images.
Car number / chassis number:
The chassis number is also embossed on the chassis plate next to the heading "CAR NO". This is the unique chassis number of the car, and that same number should be stamped into the firewall/bulkhead panel, just below the chassis plate, as shown in the images.
The Body Number is a unique number which is stamped only into the top of the radiator shroud panel (inner quarter panel), and is not listed on the chassis plate or elsewhere on the car. The body number does however relate to the chassis number / car number in that it should be approximately 500 less than the car number / chassis number. On the radiator shroud you should also see "M2" over "06", and then a 4 digit Body Number close by. The M2/06 confirms the body is a Cooper S, and the body number being within the approximate range of 500 less than the chassis number should confirm the body is original (noting of course that accidents can cause the quarter panels to be replaced). The stamping locations of these numbers on the radiator shroud were not always perfectly consistent in terms of location or stamping quality, as demonstrated by the attached images.
Australian MK1 Cooper S Engine Number:
The correct prefix on an Australian MK1 Cooper S should begin with "9FSAY", followed by a unique engine number, usually 6 digits. This prefix applies to the majority of MK1 cars, unless part of a late small batch of 48 MK1 cars fitted with the MK2 gearbox, in which case the correct prefix is "9FXEY" (see gearbox section for further details).
The engine number is located on the top of the engine block, just above the generator, and directly under the number 1 spark plug. You will see a flat area of metal, where the number is punched in. Australian Cooper S cars always had the number punched into the block, as opposed to a tag which appeared on many overseas models. The above prefix confirms that the block is a 1275 MK1 cooper S engine, but does not confirm whether the head, gearbox or other components have been changed. See the attached image for an example of the engine number appearance and location.
Engine block casting number & 'thin flange':
All Cooper S motors (MK1 and MK2) will have "AEG312" cast into the rear lower RHS of the block. Other than a small number of late cars, the MK1 Cooper S had what was known as a 'thin flange' engine block, referring to the relatively thinner area where the engine block meets the gearbox, as compared to the MK2 block. The MK1 thin flange block is approximately 10mm thick (vs the MK2 at 20mm).
Other engine block features:
Australian MK1 Cooper S Gearbox Casting Number:
The gearbox in a MK1 has synchromesh on 3 gears (gears 2 - 4), as opposed to the full synchromesh box of the MK2. However, some discussion on forums and historical documents confirm that 48 of the late MK1 Cooper S cars were in fact fitted with the MK2 full synchro gearbox. The chassis numbers to which this applied are identified in the document attached in the images.
The correct number to be cast into the majority of MK1 gearboxes (other than those last 40 mentioned above) is 22G333. This confirms that the gearbox is the correct 4 speed, 3 synchro B type remote shift, as applied to the MK1 Cooper S.
The majority of MK1 Cooper S cars were fitted with 'Hardy Spicer' universal joints (see images), as opposed to the rubber knuckle joints used on other Minis of the same era. The gearbox was also 'remote change', and contained the long mechanism as shown in the images. Note however, that some pre-1966 Cooper S cars may have been fitted with rubber knuckle CV joints, and we understand these were changed to the Hardy Spicer joints in approximately April 1966.
The gearbox may also have a unique serial number stamped into it, which will specifically confirm whether it is from a MK1 Cooper S. The correct serial number prefix, if applicable, is "12FA".
The Australian Morris Mini MK1 Cooper S had the following original mechanical features:
Several factory body modifications were made to the MK1 Cooper S which are essential for accurate identification. Some of these features are outlined below: