I have looked all over this site and elsewhere, but I can't seem to find an exact match for this watch. I originally thought it was a diamond excellency, however the dial is textured, has 3 diamonds instead of 2, has an applied bulova logo, and has 23 jewels printed on the face. the diamond excellency has none of those. It could be non conforming, or it could be a whole different model. Maybe the line book could shed some light, or I possibly missed something in an ad when I was searching.
Found both of these in the 1966/67 LIne books.
10K Rolled Gold Plate version - Diamond Excellency (yep 17J movement)
10K Gold Filled version - Beau Brummell (yep 17J movement again)
Noting found matching the 23J version.
Based on the '10K Gold Filled' case I'm at Beau Brummell (no variant)
Beau Brummell's were available with 17, 21, 23 and 30 jewelled movements