u/shouldnothaveread

I've found this lens while trawling Marketplace for cheap glass and I can't find anything about it besides it being rebranded by a small local importer (Milverson appear to have been a camera store based in New South Wales in the 60's/70's, I don't believe they're in business anymore), this lens practically doesn't exist. What I do know:

• It appears to be a preset aperture type lens
• 135mm
• ...that's it

What I would like to know:

• Who the original manufacturer is?
• Has anyone had any experience with it?
• What sort of lens mount it might be?

This last question is one that I'd really like to know. Unfortunately the photos of the mount aren't great but I don't want to pester the seller for further photos; she's an older woman clearing out her late father's estate. She's selling it super cheap but it's quite a long drive which I don't want to waste time and diesel on ($$$) if it turns out to be some weird obscure mount that would require an adapter that I'll never use on anything else, otherwise I'd just buy it now and worry about finding an adapter later.

Just a few specimens from my collection under a shortwave light.

1. I originally bought this for the lovely yellow fluorapatite crystals on the other side of the specimen but quickly found that it also had quite a bit of hyalite included. The hyalite looks weirdly out of focus when under UV light.

2. A tiny sliver of saleeite, a uranium mineral which puts out that classic radiation green glow under both shortwave and longwave light.

3. I'm fairly sure this is some lapis lazuli, a bunch of specimens I bought a couple years back all got thrown into random boxes without being labelled. Whatever it is it has a nice blue glow under shortwave.

4. A thunder egg. It's green. What more is there to say lol.