On the record player does it work? Or does the broken piece prevent that?
If working maybe $50 to $100 (in our market). If not maybe $50 to a collector.
but on the other hand have not seen anything that small (portable). See the large phonographs and they have really dropped in price from $500 to $250. Just to give you an idea.
Check the antique malls, they may know more or someone who collects them.
Hope that helps. But reading over may add to the confusion. Sorry.
Let us know what you find out.
Have no knowledge of the signs.
Good Luck