**Album**: [https://imgur.com/a/kvY4EcX](https://imgur.com/a/kvY4EcX) **Timestamp**: [https://imgur.com/a/AGt8XQR](https://imgur.com/a/AGt8XQR) ​ **The Polerouter Alternative You Never Knew You Wanted.** That's right! Bulova did have their very own micro rotor movement with the Bulova 12EBA... Well, actually it was just a Buren 1280 but that movement, was the very first micro rotor movement ever produced... ok, might be. Look, we'll get into it but we have to ask one thing out of the way first. **What is a micro rotor movement?** We all know automatic movements, right? Watches with a central oscillating rotor that rotates using gravity and the natural movement of your walk which, in turn, winds the mainspring that powers the watch. Now, take that concept, cut out about a third of the movement and place a small version of the rotor that fits into that space and there you have it! Now you have the thin quality of a mechanical watch with the convenience and practicality of an automatic. Of course, it's a bit more complicated than that but you get the idea. ​ **History** Just as I said in the intro, this movement was not made by Bulova but by Buren Watch company in 1958 utilizing their 1954 patent of the "Planetary Rotor." Some watch nerds might see this and say, "Wait a minute! Erm, actually the Universal Geneve 'Microtor' calibre 1-69 was also produced in 1958." and they're definitely annoying but also, right. There's no clear winner to who produced the first micro rotor movement since both were produced in 1958 and these companies didn't keep a clear record of their releases. Kind of reminds me of another watchmaking race, I'm looking at you, el primero, Chronomatic, & Seiko 6139. (Fun Fact: The Buren Micro Rotor was actually the base movement for the legendary chronomatic!) Although we might never find out who truly made the first micro rotor movement, one thing is for sure, for being a potential first in watchmaking history, they are incredibly under valued.Bulova didn't start using the micro rotor until 1964 with their Ambassador series. Not much else is known beyond that but it is suspected that they stopped using the movement in 1971 after Hamilton acquired Buren in 1966 and created the intramatic movement in 1971, which is found in some Ambassador models but they are exceedingly rare. The Ambassador series from Bulova is a line that is still being made to this day, maintaining the original vision of a thin dress watch for men but now utilizing a Japanese Miyota Movement.Here's a Bulova catalog image from 1967 ​ **Conclusion** A very cool piece of Swiss watchmaking history with a splash of American watchmaking. A very uniquely beautiful Case Design at a wearable 31mm makes this a must for your next night out. Be the Ambassador you know you are and get this bad boy today! ​ **Tech Specs** **Model**: Ambassador “AI” **Case size**: 31.0mm **Lug Width**: 18mm **Lug to Lug**: 38.3mm ***Thiccness***: 6.7mm **Water Resistance**: Did not pass pressure test! Only Splash Resistant **Movement**: Bulova 12EBA (Buren 1280) Micro-Rotor Movement **Crystal**: Acrylic Low Top Hat Crystal **Material**: 10K Gold-Filled ​ **Condition** **Case**: Great. Scratch in front of case between 7 & 8 o’clock. Hairline scratches along back & sides of case. See Pictures for more detail.**Strap**: New 18mm Hadley Roma Genuine Caiman Crocodile Leather Strap **Service**: Movement Serviced in May 2023. Cleaned, oiled, and regulated. DID NOT PASS DRY PRESSURE TEST. ​ I’m asking **$750 OBO** for this piece via Paypal, Venmo, or Zelle. CONUS Insured Shipping included. International shipping is available at the buyer’s expense. Only looking for sale. NO TRADES.