I agree it has similarities to the Pentax K mount but it isn't!
My thoughts are it's a Canon FD mount, but I've never owned any of those so await confirmation or otherwise from someone else who may have.

Pixel peeping I can understand that. The result of that is that the overall image will be higher quality on the K1 as the magnification of each pixel in the finished image will be less.

Meet Jason Shutter, Celebrity Photographer | Specsavers
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They're the two I most often use at the moment for the same reason. They're both convenient utility lenses rather than anything special, but what they do they do well.

Surely one has different favourites depending on the subject matter. The 31 wouldn't normally be very useful for ornithological subjects yet be great for a landscape. I appreciate there will always be exceptions. The lens I used to have and now miss was a K 20mm f4 that got stolen in Bath many moons ago. I replaced it with an M version but it never seemed quite the same.

Yes! For other readers who don't understand, when you turn on Live View you can use the cursor keys to adjust the view before pressing OK, so by holding the camera vertical, the top of tall buildings can be brought into frame without them appearing to lean backwards.

Quite possibly!
Just wish to point out again that on Pentax digital cameras, the sensor can be shifted when live view is turned on which amounts doing to the same thing with a normal lens, but it's nice to have the real thing.

Control characters can truncate the rest of the data present, or force things into the wrong fields. Ideally any characters that might cause that problem should be stripped out by the input routines. So if it is the copyright symbol, for instance, the software should strip it out. The usual way to do this is to only accept the normal alpha-numeric characters in the string and discard the rest. It's actually quite easy to insert a control character inadvertently so checking the input for validity is pretty important.
I'm not saying that this is the issue with PU and your exifs, but it might be.

As he said? And what happened to it; just fall to pieces?
https://photo.stackexchange.com/questions/15129/how-much-does-it-cost-to-replace...

This table link might help identifying the lenses from the exif directly.