The Dynamo on the early E Types are a tough one. The first 500 cars had a LUCAS Dynamo 22531 which has C45 indication the diameter. This dynamo was used about until end August 61. Then JAGUAR replaced it with the then introduced LUCAS 22902 B C42 indication a core size of 4.2 “. Only a few hundred were made by the date car VIN 885066 was build first week October 61. So it has to have the “newer” 22902 dynamo dated not later than 9 – 61.