11-08-2019, 04:51 PM
There is no fundamental difference between the first B1 car and the last B4 car; they are the Car Numbers, issued in numerical sequence to all Austin Sevens, so when the works reached B1-9999 the B2 sequence started and so on. Any detail alterations, such as the change from 8-stud to 10-stud blocks, did not result in any change of Car Number identity.