two scalpel handles

Member hostacollector showed their red one of these just a little while ago as a "what is it?".

https://www.collectorsweekly.com/stories/305795-red-handle-tool-of-some-kind?in=user

Which prompted me to go find the two I have, one of which is very much like hosta's but for its black (or very, very dark green) color and its "No.5" size imprinted on the end of its handle -- hosta's has a "6" in the same spot but its other imprint is the same "B-P MADE IN U.S.A.". My metal one (surgical stainless steel, probably) is imprinted "BARD-PARKER" on one side and "MADE IN U.S.A." on the other, with a "3" on its handle end. I'm guessing (but don't know for sure) that 'B-P' = 'Bard-Parker' and thus these were all made by the same company. Also guessing that scalpels come in various 'numbered' sizes that Medical Professionals would understand instantly...but I'm not one of them... ;-)

My first couple pics also show a brand new fresh blade still sealed in its foil envelope, and the second couple pics are an attempt to show how the blade (or others of different shape or size) slide then clip onto the (either) handle. In pic 3 the blade has been removed from one handle entirely, in pic 4 it is partially reinstalled on the other -- sliding it a little bit further toward the handle would allow its rear end to 'clip' in place with its own spring tension. Just *be careful* when you try to un-do a blade to switch 'em out -- they're WAY-SHARP (even when technically 'dull') just as a scalpel should be...???!!! ;-) :-) :-)