Any Ideas?

[Mick93]

Dated June 20, then maybe 11 or 17.  Cant find anything like it so far.

[GB_Amateur]

I think I know because I have some.  They are part of the mechanism that joins headboard and tailboard of beds to the side rails.  (Antique beds, not modern ones.)   If I can dig them up amonst my museum collection  of pieces parts, I may be able to better show how they work.

BTW, in the future it will help to show scale, either by photographing a measure/ruler along with the unknown, or something of common knowledge (such as a coin).

[Rick N. MI]

Cool find! By the paper behind it, it doesn't look big.

[geof_junk]

Might be along the lines of this

 

https://www.sellingantiques.co.uk/731621/onesided-boot-scraper/

[Valens Legacy]

This was on Etsy and is what GB is talking about.

[Mick93]

Yeah sorry about that ,,,it is 3 inches by 3 inches and thanks for the help.

 

[GB_Amateur]

11 hours ago, Valens Legacy said:

This was on Etsy and is what GB is talking about.

Yep, those are the mating pieces.  The ring shaped one is embedded in the side rail while the keyhole slotted ones are in the headboard & tailboard.  It's quite a robust method (which of course is required!).😁