Hadn't thought of GPO. Always liked the 232 with ringer on bottom & little drawer that pulls out. Real ones probably out of my price range though. : /
Anyway, I'll take a stab at it & likely embarrass myself. ; )
Could be a...
162 or 164 handset?
Illustration (with larger area for Christmas message) of a type 10 or 12 dial?
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"Better to remain silent and be thought a fool than speak and remove all doubt." -- either Abraham Lincoln or Samuel Clemmons. I think the philosophers are still debating that one.
