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"Mine has also the same case as yours but with screw down crown." Your watches are super nice! I really like the California dial. The 2782 in my BB has the calendar spacer and all calendar works removed as it originally came with quick set date. These watches might be small by today's standards but they are great everyday watches for that reason. "Wish I could source more of these 5015 cases!" For a while after I got mine, I would see one for sale now and then, but none were claimed to be genuine. Twenty years later they have become rare! and genuine!, even when sporting an ETA movement with a rlx sticker on the rotor. The 'BB' on eBay was the first one I have seen in a few years. No way I would pay $1331USD for one though. Ha! From the Ranfft website: 21600 A/h: 2750 / 2770, 2776: no date 2752 / 2772: date 2753 / 2773: date, precision regulator 2758 / 2778: day, date 2759 / 2779: day, date, precision regulator 2761 / 2781: quick set date, high 2762 / 2782: quick set date 2763 / 2783: quick set date 2763-F6 / 2783-F6: quick set date, digital 2768 / 2788: day, quick set date 2769 / 2789: quick set day and date 2769-1 / 2789-1: quick set day and date, double-language 28800 A/h: 2751 / 2771: no date 2754 / 2774: date 2760 / 2780: day, date 2764 / 2784: quick set date - / 2790 : quick set day and date - / 2790-1: quick set day and date, double-language - / 2791: quick set date, high

And here it is with final mods (Legran 666ft sub hands, shorter minute). Always thought size would turn it into a display watch but actually became a daily beater… wish I could source more of these 5015 cases! but 3mm difference in diameter can make a difference and wrist time is actually being divided with this one (sorry out of topic, but could not resist!):

They are really nice R. Mine has also the same case as yours but with screw down crown. I tried a 2789 first but stem height is too much for a right alignment so I went for a 2824 with stem position 1mm lower. Dial was replaced for a self made california and military hands adjusted. I did replace them later for mercedes but had to find shorter minute hands not to go over the chapter ring. will post updated work later. best M.

"So what's your theory on the same SN?" Since all three of my 'BB' watches have the same reference and serial numbers, I would guess most or all of the replicas made by the same outfit that made mine will have the same numbers. Probably/maybe. I have seen a few replicas with engine turned bezels but do not know what the numbers were. Afaik these watches are all about 20 years old and I have not seen any new watches like this offered for sale in a long time. My other two are still nos from the same order as the one in my pics. The truth is these cases are very well made and many probably ended up with fresh ETAs or as Frankensteins. The dials on the examples I have seen have the SCOC blurb and originals usually have 'Officially Certified Chronometer', 'Chronometer', or no brag line at all on the dials. All the BB cases I have seen had 'snap in' crystals and were not clamped on the case by a removable bezel like later models, mine included. I had a nice genuine BB a while back needing some autowind parts and I traded it for a super fine Hamilton 992B and some other watch stuff. The aw assemblies on these things are junk imho. Back when BBs were Hot, I ran into one Frankenstein BB with a genuine case, dial, etc. and it had the original 'hubcap' over the back of the movement with a genuine BB rotor. The catch was it had a Bulova automatic movement hidden under the hubcap with a looong winding rotor axle sticking through the hubcap with the BB rotor mounted on it. It took a lot of time and botching skill for someone to do all of that. It's a good story but I can't tell it because there is a famous/infamous watch guy involved and dumbo me got in the middle of it, trying to help.