1981 Seiko SQ men's vintage watches X2. Model references 7123-8290 and 7123-8430 - YouTube
Seiko SQ NOS Stainless Steel 1970s - Gisbert A. Joseph Watches
Sold at Auction: Gentlemans vintage SEIKO SQ 100 Quartz wristwatch finished in silver tone with stainless steel bracelet. Day/Date model with sweeping second hand. Working when tested. Excellent condition for age.
Seiko Quartz SQ Vintage 7123-805M 1980's for $194 for sale from a Trusted Seller on Chrono24
Gent's Vintage Seiko SQ Wrist Watch - Etsy
Snazzy SEIKO SQ WATCH 1981 Watch Mens Round Black Gilt Dial - Etsy