DIAL FACE: BULOVA, 23JEWEL, AUTOMATIC - CASE BACK: BULOVA: BASE METAL BEZEL, STAINLESS STEEL BACK. MOVEMENT: BULOVA WATCH CO, 23 TWENTY-THREE JEWELS, 11AOACB. INSIDE CASE BACK: RV CONNEDTED OR R WITH CHEDK MARK, 7621-1, SWISS. WATCH BAND: SPEIDEL USA, EXPANSION. EBAY SELLER STATED IT WAS A 1974 WATCH BUT NO DATE CODES ON CASE BACK OR MOVEMENT.
My guess would be 1974 or thereabouts. Doc describes this as the 'last calibre family from Bulova'. I take that to mean after this there were no more new calibre series. I haven't found any detailed history regarding what movts or manufacturing procedures Bulova was using, other than they were purchased by Loew's in 1979. We came across unmarked movts in Caravelles while at school, and these resembled Russian and Chinese calibres, so at what point this started to happen in any of the main lines is unknown-however, if today's Bulova is any indicator, they may have kept the best movts for the main line, that is, the Bulova signed watches.
My impression is that this is an in house Bulova movt., and as Doc says, the last of its kind.
I contacted the seller of the watch and asked him how he established the 1974 date. He reported that he purchased an identical watch that was identified as a 1974, also having the faceted crystal. I've scoured the rotor and under the rotor of the movement and the case back again and can find no date code or indications there was ever one.
Its interesting that there is no date code/symbol as early as 1974ish for this example. Wish we had a way to "guess" the date other than what an eBay seller recollects from a previously owned watch. Maybe the sellers first example did have an N4 date symbol on its rotor.... Either way, it's an unknown model name to me.