Hi Steve, I'm not a guru, but I can use google. 3400: caliber 549 (based on JLC caliber 889/2) and 5800: caliber 517/1 (based on Fredric Piquet FP1150). Nice watch btw.

Sep 14, 2021,12:07 PM

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5800BA vs 3400BA ?

 By: Steve (UK) : September 14th, 2021-11:43
Hi, Can any Breguet 'guru' tell me the difference between the 5800BA (35.5mm) and the Breguet 3400BA (35.0mm) Surely it is more than the case size 0.5mm ? I have contacted Breguet UK and they don't seem to know! [Picture added -- FabR (moderator)] ...  

Nicely done!

 By: Spangles - Dr. Tabby : September 14th, 2021-12:46
And excellent watches! Breguet is an oasis for lovely watches in this time of hype.

Thank you :)

 By: Steve (UK) : September 15th, 2021-06:40

Classicly classic.

 By: Uncle Chico : September 14th, 2021-13:31