Mamiya 645 Pro serial numbers?

[crumpet8]

Hey,

Does anyone know how the serial number system works for Mamya 645 pro film backs? Also I have a couple of viewfinders with a gold sticker on each. 1 says RA the other SK. Is this where they were quality controlled or something?

Thanks,

Dan

 

[Kirks518]

IIRC, the gold stickers are closer to Mamiya's system for manufacturing date, moreso then the serial number. It's similar to Canon's dating system.