whats this then ?

[mrshells]

from the fram number can anyone identify this ?
i think its reads ZA7R  but cant find any listings for that prefix
as a clue its an A1o rigid frame

[trevinoz]

Mr Shells,
                 It seems that when the plunger frame was introduced the rigid gained the "R" to differentiate from the plunger's "S".
My '51 frame has the "R" but the '47 doesn't.
Trev.

[mrshells]

Thanks Id  thought oh that as my 52 plunger has an S but I cant find anything  official to verify it  ????

[Brian]

Its a 51' rigid frame and like Trev says the rigids seem to have the R stamped in them. The interesting thing is most dating information available doesnt seem to mention the R but always notes the S with the spring frames.

I've added a scan from the parts book, note that it has the S with the spring frames but no R with the rigids.

Just one of those odd things.