I don't think the band is the original, because it says "Speidel USA" on each link, and some links are backwards?
No Sir, we just have conflicting ads for your lovely watch!
Best call it a Date King.
EDIT:- I have now found two 1969 ads calling this a Sea King, there is a big price difference between the two models, but no case metal description in either.
All pre-1969 ads call it a Date King, so as your watch is dated to 1969, it is a Sea King, and looking at the bands in the ads and the one on your watch, I would have to say that your band is original, and your variant would then be the "DY" in the bottom ad as the band matches yours.
BTW, Bulova often used Kreisler bands on their watches.
EDIT2:- Maybe the first letter in the variant stands for "Date"?
July 1969 Daily Time Herald.
May 1969 St. Joseph News Press.
In reply to Based on the whale symbol on by mybulova_admin
These ads have watches with "whale" dials, yet are described "water resistant".
Looking through the database for all ads, we have Sea Kings, Presidents, Senators, different sorts of Clippers with "whale" dials, none earlier than 1969, and none marked or described as "waterproof"
I think "waterproof" became "water resistant" around 1969 for all watch brands, and the whale first appeared in this year too.
1972 ad.
1969 ad. This one has Sea Kings with whale dials.
Strangely, Rotary has recently started marking the backs of some of their water resistant watches "waterproof"!
Thanks. I took this to a jeweler who sent it to a Bulova repair. This was given to me by my Grandmother, when her husband passed. When I tried to set the time I pulled the stem out. When I took it to the jeweler he is the one who told me that it was self winding (removing the back verified no room for a battery.) I have been unable to find a picture of this exact watch (just the whale and no writing) however, I did notice today that under the Roman numeral "VI" there is this: "T SWISS T." I don't know if that is significant and not sure why I didn't notice it before...