Diamond dial. Don't believe I've seen this one before.
In reply to Nice back-up conformation by OldTicker
Unknown.
On a related matter, I am starting to think there is more to the variant scenario than we think. Bracelet would have been an easy upgrade, higher jewel count, also. But I have noticed similar watches with identical movts marked with different factory identifiers. Specifically, the number of adjustments, and in rare cases, number of adjustment positions. The idea being, the higher the jewel count, the higher the grade, but as well, the higher the adjustment count, the higher the grade. The adjustment marking would signal to the jeweller and customer that his watch was indeed different from the lower priced models. (Albeit not by much) My point being, this may be another defining characteristic of a variant. Maybe this has been mentioned before. Usually adjustment positions relate more to chronometers, (5 pos) and I don't think there is an example of a Bulova chronometer, but I could be wrong. 3 positons is somewhat standard.
The adjustments themselves are designed to indicate a higher degree of attention, and are meant to provide a differentiation between 'unadjusted' movts. Keeping in mind also, that movts marked 'unadjusted' usually were no such thing, it was a way to get around import tariffs.
There was one adjusted to five positions, a Transport Special? There are two, and the other one I can't read, it looks like it also says 5. That would qualify as a chronometer, but I'm afraid I don't know for certain what the R stands for, possibly Railroad. These are the only ones I have seen like this, and they may have been special contract watches, I'm not sure if Bulova offered such grades to the general public.
By definition, a quartz or tuning fork watch qualifies as a chronometer by virtue of its accuracy, but I'm more interested in the mechanical movts. Sorry, I'm getting off-topic here.