I was just watching Time Team S17-E11 (Litlington, Cambridgeshire) [available on youtube at https://www.youtube.com/watch?v=IAgN1GIT5Us] and I have a possible Pentax sighting. At 3:26, one of the archaeologists is using a reversed lens as a loupe, and to me it looks very much like a fairly large-aperture K-mount! The position of the red dot, bayonet mounts, aperture lever, etc. seem to match what I see on the back of my lenses, and what I can see of the aperture ring looks about right, too.
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