What Is It? game 250

It's time for the 250th edition of our collaboration with the always amusing What Is It? Blog. Can you guess what the pictured item is? Or can you make up something interesting?

Place your guess in the comment section below. One guess per comment, please, though you can enter as many guesses as you'd like in separate comments. Post no URLs or weblinks, as doing so will forfeit your entry. Two winners: the first correct guess and the funniest (albeit ultimately wrong) guess will win T-shirt from the NeatoShop.

Please write your T-shirt selection alongside your guess. If you don't include a selection, you forfeit the prize, okay? May we suggest the Science T-Shirt, Funny T-Shirt and Artist-Designed T-Shirts?

See all this week's mystery objects at the What Is It? Blog. Good luck!

Update: the pictured object is a vintage brass trigger guard for a gun. The first comment, from Anker, had the correct answer, which is good for a t-shirt from the NeatoShop! The funniest answer came from The Professor, who gave an explanation of how to "point Percy at the Porcelain," which may be a little racy for delicate sensibilities, so you can go read it for yourself, and maybe even give it a ♥. So he wins a t-shirt from the NeatoShop as well! Find the answers to all this week's mystery items at the What Is It? blog.