This is a vintage Swiss Army vintage quartz watch with date calendar and leather strap (don't have much info...).
A little about the history of Swiss Army Watch 🇨 🇭; The Swiss company S.A.W. Company SA was known for producing bulletproof tool watches and had a large word-of-mouth following before the explosion of Micro brands worldwide. The company (long with several others) was eventually purchased by Victorinox (Swiss Army Brands, Inc.) in 1999, in their effort to eliminate brand confusion. So any that you see intact are rare. I'm not certain of the exact build date of this model.