Bill
29341
Seiko 6105-8000 and the 6105-8009 appeared in the 1968-1970 period.
Dec 28, 2018,03:26 AM
Here are the two variations know as proof proof and resist resist.
These are the combination of what is on the dial and case back. These terms preceded the water resistant i thing something iso or claims using proof.
Proof was also used on the original seiko 62mas launched in 1965.
Below the 6105-8000 with proof on the dial and water proof on the case back.
Below is tye Seiko 6105-8009 with resist on the dial and water resist on the case back.