This is a Breitling Chronomat Ref B13048. 40mm, but wears like a 39mm in my opinion. Selling my first luxury watch that is presumably from my birth year 1996. I am cleaning out my collection as it has grown over the years. Also, I recently purchased my grail watch! The watch runs perfectly and all the chronograph and date features work as expected (i.e. keeps and tracks time, resets to 12o'clock, date changes instantly at midnight, etc etc). Comes on a Hirsch Crocodile Embossed Leather Strap 20mm XL with OEM Breitling Gold toned Buckle. It was last serviced by a very well-respected WatchUSeek watchmaker for $800 in 2019. I have receipts attached for proof.The watch currently has a worn out crown and the top chronograph pusher plating is fading. To address this, I am also including brand new Breitling OEM crown and 2 chronograph pushers! There are actually 2 crowns, but I didn't know the Tap size. So the 2 crowns are Tap 6 and Tap 10. One of them is guaranteed to fit. $2250 Venmo or Zelle. Generic details: This Breitling Chronomat B13048 has 12 solid 18k gold screws around the outer ends of the bezel to secure it and four solid 18k gold quarter hour rider tabs to mark your time with the prominent unidirectional rotating bezel. It has a screw-down dome-shaped gold winding crown, and two gold dome-shaped chronograph push buttons. All of the hands are gold gilded with the infamous Breitling anchor at the end of the second hand which is seen only on Breitling's higher end lines. There is a screw-down solid case back embossed around the polished perimeter with " Breitling Chronomat B13048 Chronomat MANUFACTURE EN SUISSE – CHRONOGRAPHE – 100M," and at the center is the infamous BREITLING Wings Insigna with "BREITLING 1884". The 40mm diameter case is a solid three-body case, straight lugs, bracelet, and stepped flat bezel are brushed/polished. The dial is ivory with applied faceted gold baton hour markers, luminous dot indices, and an outer gold filter indiced minute/one-fifth second scale. Around the perimeter is a tachymeter scale to 1000 UPH. It has gold baton hands with luminous inserts, and a gold center sweep second hand with a Breitling logo counter balance. There is a date aperture window at the 3 o'clock position, and there are three champagne guilloche recessed subsidiary dials, including a running seconds register at 9 o'clock, a 12-hour chronograph totalizer at 6 o'clock, and there is a 30-minute totalizer at 12 o'clock. It has a 42-hour power reserve at full wind, and it's water resistant to 100 meters/330 feet. The 14mm thick case, dial, movement are all signed and is a prominent 44mm with the crown. This Breitling Chronomat B13048 has a Breitling Calibre 13 (base Valjoux 7750) movement. It's rhodium-plated, and it's constructed with 25 jewels, a shock absorber device, and a straight-line lever escapement. It includes a monometallic balance, a self-compensating flat balance spring, a micrometer regulator, and a hacking seconds mechanism for precision time setting. Incredible in-house Breitling movement. This is Breitling's work horse movement. The Breitling Chronomat B13048 was introduced in 1984, and was produced until 1996.