My 40mm Airman No.1 confuse me. On one hand it's an almost perfect replica of a vintage watch worn by pilots that was used to help them co-ordinate flight plans, hence it's a tool watch. On the other hand it's delicate looking, it has a very thin profile, it's light on the wrist, and has a WR that is basically nil, so it's not a tool watch.
Its also the only watch that gets noticed when I wear it, despite being a bit plain looking and not looking particularly expensive.
it's an Airman and I like it a lot because there are no other watches like it, and because it's so comfortable to wear on its incredibly supple leather strap.
I'm a big fan of watches that are interesting because they are either unique, have interesting features, well designed or simply offer a great value for their price.