Seiko C153-5007 01 | A nice calculator watch from Seiko. Alm… | Flickr
Vintage Seiko digital Calculator mens stainless steel watch, ref.# C153-5007 | WatchCharts
birthyearwatches.com - 1977 Seiko C153-5009 Calculator watch. Can you see what I did there? #seikolover #seikocollector #seiko #1977 #birthyearwatch | Facebook
Seiko C153-5007 (Calculator) for £163 for sale from a Private Seller on Chrono24