lens mount id please

Not a Pentax K mount nor an Olympus OM mount. Not a Praktica bayonet mount nor old style Fuji X mount. Beyond that I cannot help.

What does the lens bezel say?

Edit: I have changed my mind. That looks very like a Pentax K mount with the aperture set to ƒ/3.5. There are many variants of these as Pentax tried various autofocus and electronic aperture control which means that the electronic contacts can be in a variety of places.
 
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Thanks John.
100-300mm 4.5-6.7 DL - made in Japan - 55 sigma zoom
It has no other identifier.
 
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The lens cap says SA/KPR but i have searched google but cant find this particular mount.

by John Garton, on Flickr

That's because it's multiple mounts. Caps that fit Sigma's SA mount also fit Pentax K & Ricoh K...
SA mount is not interchangeable with the others having a shorter registration & different electrical protocols.
 
Thanks Toni, it appears to be a Pentax "Kaf" mount looking at your second link.

I thought so too - found the first link & posted it because although the dscussion subject was different, those mounts looked the same. Carried on looking afterward & found the second link, where they have a picture on a mount that looks virtually identical.
 
Thanks for the replys guys..(y)

I was aware that the cap was compatible with both mounts, i maybe should of been a bit clearer there.

I had searched for quite a while and read a fair few pages on pentax forums, but there are 2 differences between this mount and most of the pics i could find, theres the sideways flat contact and there is no ricoh pin on this so i couldnt be sure...ancient_mariners search skills must be better than mine.
 
Just lucky I guess (searched for Ricoh lens mount in images)
 
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