birthyearwatches.com - 1977 Seiko C153-5009 Calculator watch. Can you see what I did there? #seikolover #seikocollector #seiko #1977 #birthyearwatch | Facebook
Vintage Digital Seiko C153 5011 Calculator Watch all Original -working condition | eBay
SEIKO DIGITAL TYPE CALCULATOR | Only Online Auction | Geneve, December 9. 2020
SOLD 1977 Seiko LCD Calculator watch C153-5009 - Birth Year Watches