Help with this adapter.

[Nikon photographer]

A few months ago I bought in a load of camera gear, including some Four Thirds camera and lenses, and quite a few adapters, all of them apart from this one I've figured out, now I need to figure out what mount this is, I know it's not Nikon F or Olympus OM, can anyone please give me a positive identification.

 

[Box Brownie]

No idea just from looking at it..........

It might help if you showed the other end too, plus what if any markings are there on it???

Edit

Google image search has this suggestion

"AI Overview

The selected region shows a silver camera lens mount adapter, which appears to be a Leica M-mount adapter used to attach classic manual lenses to a modern digital camera body."

PS though looking at examples of the M mount, I am not convinced

 

[Nikon photographer]

The rear is the mount for Four Thirds, there's no markings on it at all, there was 5 adapters and non of them had any markings on them, luckily I still have a few Nikon F and Olympus OM mount lenses, there was 2 that was M42, luckily I still have my Yashica TL Electro.

 

[RyanB]

Looks like Pentax K mount to me

 

[Nikon photographer]

Looks like Pentax K mount to me
View attachment 492582

Thank you, I think you're correct...