Odd... I've been studying the 3 pence today on account of reading one of Orwell's novels. The main character is carrying one in his pocket, despising it and not wanting to spend it. He finally throws it away in disgust.
I haven't been able to get any satisfactory explanation as to exactly why he hates the Joey so much, nor whether it's a silver or base metal piece. For some reason - or maybe multiple reasons - he will be scorned if he passes it. It's probably because it reveals his dire poverty, but it also could be that it's a devalued, demonetized or new non-silver piece which would be hard to pass in the mid 1930's. He remembers distinctly when he got it in change, and that he took it out of politeness.
"Two minutes ago I would have sold my chances for a tired dime." Fred Astaire