Obviously brain wasn't in gear at Kew last week - I should have re-read this thread before my visit - I now have details of the Int. Bottle Co. Reg. No. 711272 - but it has nothing whatsoever to do with a dog.
We've discussed all the possibilities around this one before, I know, but just to reiterate ...................
Czechoslovakia (the spelling would indicate item is for the U.K. market), not appearing on export items until c. 1920 - and U.K. Board of Trade Reg. Nos. from that period are six digits and not five, and they continue as six digits from then on.
Not impossible that due to a fault in the mould, it's the first digit that's missing, rather than the last one............ this then shifts the possible date to 1932, which not out of the question. Might this have been for the States?? perhaps.
Anyway, run out of ideas for the moment.
Attached is the drawing, from Kew, for Int. Bottle Co. Reg. 711272 dated 21st February 1925 - no idea what it is though, so suggestions please, on a postcard, to the editor. Possibly a cruet or scent/perfume?