Terry:
Ah, I didn't pay close enough attention to the pics as I now see the stepped watertable. T&S 386xx was proofed in June of 1930. I'll have to see if I can find a few more to do a reverse projection. I'd guess bewteen 1905(not 1950-typeO) and 1912. Also I don't remember when the Nimrod patent was granted and how long it was enforce. I'd have to stare a bit longer and then defer to an engraving authority, but the Art Nouveau just might have been by Franz Keller. Is the serial 238xx? Does it have ejectors by chance?

Kind Regards,

Raimey
rse