Here's an interesting piece which is either called the Juvenia "Architect" or "Protractor" watch. I've been offered this locally. It's not usually the type of watch I'd have in my collection, so I think it's unlikely that I'll decide to buy it unless I just really fall in love with it in person, but it's very unusual, and my googling suggests that it is legitimately rare. My searches also turn up a lot of connections with Johnny Depp, who apparently is famous for wearing the gold-plated version in an Esquire article in 2008. Hodinkee actually wrote a blog post about it.
http://hoodinkee-beta.squarespace.c...or-pure-1960s-style-a-favorite-of-johnny.html

I hope some members enjoy this rare sighting!

 

I've often thought the Protractor would make a good companion to an Arithmo:


I could see a curated collection focused on vintage geek watches like these. Maybe also a Chronomat and a Calculator

 

Right, an actual architect might really appreciate this watch.

 

Yes, anyone in a technical trade, engineering, etc. There are also collectors of vintage drawing tools who'd love a watch like that:

 

Unfortunately, I don't think it's going to be super-cheap, so it would need to be someone like that who also doesn't mind spending a couple of grand on an old watch.

 

I really love that watch. I must find one.

 

Always loved the slide rule... agree wont be cheap and too strange for me. Cool though for the right collector!

 

You could call it a real "tool" watch!

 

This reminds me of a knife made for sharpening quill pens that was part of a Spanish map makers or navigators tool kit. It doubled or tripled as dividers and drawing compass and the legs folded back exactly like the grips of a balisong butterfly knife. I suspect from the age of that instrument that it predated the balisong and may have inspired that design.