The pentax did have a bayonet mount, so maybe it's for those models, not
sure if it would be a topcon/exacta mount.

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> Picked up a 2.8 28mm lens for next to nothing that I thought was a Minolta
> mount, but it doesn't fit my XE-7. It's a bayonet, the backcap says
> "Asahi." Pentax mount maybe? Is there an adapter out there perhaps?
>
> Thanks for any suggestions.