Seiko SQ 100] Nothing like nos for that vintage itch : r/Watches
Vintage Seiko SQ 100 Black 80s Special - Etsy
Seiko SQ-100 Chronograph "Salmon Dial" — The Watch Connection
Seiko Chronograph SQ100 V657-7030 vintage rare 2000's – Temple of Time
Vintage Seiko SQ 100 Ref 6923-5130 Quartz Watch Mens Day Date - Etsy
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.