A Mother's Day Chess Plaque

You might expect this fortnightly series on Top eBay Chess Items by Price to fall on Mother's Day once every two years, but due to the vagaries of blogging -- like a vacation once in a while -- adherence to a calendar cycle isn't that strict. Last year we had Chess Builders (May 2016), and I could just as easily go two consecutive years without observing Mom's special day.

Titled '~1930 CHESS MEDAL / PLAQUE YOUNG GIRL / WOMAN WITH CHESS 147 x 79 mm SIGN.CA4?', the item pictured below sold for US $327.55 after three bids from three bidders. It was one of a very few chess items that would make an appropriate Mother's Day gift.

The description repeated the title and added,

Size / Weight / Material:
147.0 mm x 79.0 mm x 6.0 mm / 232.0 gr / BRONZE

Condition: EXCELLENT; min. sign of use

Since the only identification on the piece is 'SIGN.CA4?' (in the upper left corner), and since I have no idea how to start figuring out what that means, I'll stop here. 'Happy Mother's Day!' to all mothers reading this post.