This is a true "Hand Made Watch". When it was made,he was making less than 1000 a year with a staff of 16 or less. I say when it was made because it is New Old Stock. The calibration certificate gives all the info. calibration started on 11 Feb.03 and was completed on 24Mar.03 signed by M. Braun. It was made in his original workshop in Birkenfeld, Germany. This is SN 022...total number unknown. The reason I'm giving all this back ground info. is because a year after this, Martin was wooed by the" Darkside " and entered into a business deal with the Franck Muller Group. He closed up shop and moved to MullerLand in Switzerland. Bad things began to happen and after a few years Martin left Mullerland and ran back to Germany. He kept his soul...But Muller got his name! So..No more Martin Braun Grande Chrono's....Now to the watch. 42mm. With a K1 crystal, Alligator strap and 20mm lugs. It has a three part case with the center section fluted / coin edge. Seven screws secure the exhibition case back. The engine is the 7750 with modifications from Soprod. The rotor is unmarked....Some are engraved Martin Braum, not this one. German Silver dial,Blue steel hands (no lume). At 42mm it has a great presence on my wrist. I would prefer 40mm. but I must make do with this monster. Having this watch for just a day, I can't say much about accuracy now, but when it left Martin it was +2 s/d....By the way, all his watches are calibrated after being cased.