Does anyone recognize this heater valve. I have several of these, acquired with a pile of Smith’s stuff  bought when they closed down their Toronto operation. They are brand new and I am loath to throw them out.

unknown-2.jpg

They look vaguely familar to me but I just cannot remember what car I’ve seen them on. Unfortunately there is no part number on them anywhere and the lettering on the body reads:”USE SPANNER AS NEAR THREAD AS POSSIBLE”.