Sterling Silver Umbrella Brooch

I got this brooch, along with the two rings posted last week, in a swap with my friend at the pawn shop for an .800 silver novelty pocket ashtray. This brooch is made in Holland after 1953. Don't recognize the "S" stamp. There is a really small mark on the pin itself, but I think it's just another .925 stamp.

Thanks for looking/loving, CW friends!
~Bonnie~