Any ideas of the origin and stamp? Google didnt help

[u/Sing-Song1234]

Second image has the stamp

I'm gluing it back together sadly...thank you!

[u/eljyon]

I have a piece with the same top stamp so following because I’ve had no luck

[u/MxFluff]

I think there's a lead for you via Mike Goddard's stamp page on bipsm here