International Model 333.149. "Maeder-Leschot, Biel, Switzerland" symbol on inside of case, along with "Stainless Steel Back, Bezel Gold Plated 6 40 Microns "M0" and the number 333.149.
Movement marked Swiss with no import stamp or "USA".
Case back exterior marked "Bulova Swiss" and "Waterproof"; with the number 1.73683.
This watch is identical to Rev. Rob's with the exception of the markings being slightly different and it lacks the "International" text on the face. After viewing Rob's example and comparing it to mine, as well as reading the previous thread, here are my thoughts. This would appear to be "International Collection" produced entirely overseas for the International (non-US) market. My thought is that if a watch has "International" on the face it was a European design introduced to the US market and a blank face was marketed in Europe and/or Canada. It would seem that 333.149 is the designation of the case/watch (same as Rob's) and 1.73683 is the serial number. The back of this case issuper clean; first character of S/N is absolutely a "1" and not an "I".
That said, I would call this an International "333.149", following the lead of a couple of the previously noted ads that give "International" watches a number designation, as opposed to a name.