Have you checked the "unknown" data base for this one. I am pretty sure we have at least one of this one in there and I don't know if it has ever had an advert found to ID it. Very nice watch and well worth getting it serviced and cleaned up. It has had a hands change, should be cathedral hands.
JP
It doesn't look like any of the unknowns, but it certainly looks very much like some, but not all, of the Sky Kings.
I am pretty sure that this has been called a "Sky King" here, although there is a little disagreement from a few and the top and bottom horizontals are slightly different from the few ads that have come up.
My first impression was Sky King.
It is a Sky King, and there are some new ads showing this XX engraving, in both ad Databases.
Here is one.

Here is another.

At my house this is a Sky king
Bobbee, it will be interesting to see if the Sky King pictured in the advert shown above sports the top and bottom bands like most other adverts for the SK do.
Doesn't look like it does in this ad and would therefore be the first proving what we have all believed for a while now, that this case version is also the Sky King.
I do not believe this to be a Sky King. In addition to the vertical bands the engraving pattern on a Sky King is "fishes" not x's.
Jay
vintagebulova.com
Blow-up originally shown in GB's two Sky King threads over a month ago.

Blow-up of top ad. BETTER?

Jay, what about the one you have with the XX engraving you have called a Sky King? : )
When I sold that watch in 2008 that's what I thought it was, now I know better.
Jay
vintagebulova.com
But the ads show it IS a Sky King, I have seen other ads with the XX markings, and will try to find them again.