Vintage Nisus 170 Two Tone Salamander Dial Watch Unusual Lugs

Interesting and unusual Nisus watch.

I'd say c. 1940's. 

Attractively aged two tone dial with roman numerals.

All original.

Fully functional.

Noteworthy are the radial square lugs with the curved bars.

Case measures 33mm without crown.

Lug spacing is 16 or 17mm (curved so hard to be specific).

Takes a 16mm strap.