they do come up quite regular on ebay uk.my new one doesn't exactly match the ones on Mr.Razor site.so..mine on top.. mine could be an early 48?,late 47,who knows..
Well, Gillette has a history of using older parts and/or cases. Probably another version on the case you have.
Thanks for the info. Looks like I'm getting a new brush! Vintage Gillette razors don't often turn my head but that one is incredible. Congratulations!