What do you mean by “The date calculator suggests June of 1981”? Nice score by the way. Is it also known as the “Sumo”?
There is an online tool on the Seiko / Citizen watch forum that will calculate the manufacture date if you put in the movement number and serial number.
Davosa Ternos Diver on a leather Jurgens Flieger bund strap…This leather strap’s pretty cool, especially since the underside’s lined with rubber for tropical enviornments – comes in handy in the hot/humid S. Florida weather.
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