C77E engine number and C78 frame VIN

[Chas Morgan]

Hi,

Can anyone advise please. My bike has a C77E engine number and a C78 frame VIN number. Was this a common thing or has a replacement engine been installed at some stage in the C78 frame. I’m trying to get an accurate date for the bikes manufacturer.
Thanks

[danielzink]

Mine's a '64....

CA78-100xxxx frame

CA77E-100xxxx engine

It is what it is.

Dan