Vintage 1993 Seiko Tank Gold Tone Quartz Tank Watch w/Bracelet Band 2E20-6959
Serial #3D0453 

Bonus: the original Seiko Caliber No.2E20B Parts Catalog & Technical Guide is attached to this listing for your convenience.

This vintage Seiko Tank watch from 1993 features a gold-tone stainless steel case with a smooth fixed bezel and a sunburst gold dial adorned with baton indexes. The watch is powered by a quartz movement with 1 jewel and is water-resistant. It has a classic design, a hidden fold clasp bracelet band, and a rectangular watch shape with a polished case finish. The Seiko Tank watch is a timeless piece that exudes elegance and sophistication, perfect for a stylish woman who appreciates vintage timepieces.

Watch underside of the band has corroded over time, but this does not show at all on the outer surface or sides of the band. I believe it may be the band model and manufacturer for this watch model because I've seen the same corrosion on this same band  on other watches like this one, but not on other models and watches. Could easily be cleaned - it appears to be a brass alloy under the gold tone - redipped, or you could simply replace it with band made of a non-corrosive base metal such as stainless steel.  

Otherwise, the crystal on this watch it has some scratching. 
This watch also needs a new battery and cleaning / maintenance service.