The Real McCoy's

Buco J-31 Jacket


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Founded in 1933 as the "Joseph Buegeleisen Co.” Buco were first specialists in motorcycle accessories and saddlebags. In 1947, they launched "Buco", a full apparel line with the slogan: “Motorcycle jackets, gloves, caps, belts and bags all cut and sewn by life long craftsmen dedicated to the task at hand”. The Real McCoy's acquired the license to produce the brand, and they have applied their usual diligence and attention to detail in producing Buco pieces.

All of the Real McCoy's flagship leather jackets are made at their headquarters in Kobe. Before sewing begins, the custom-tanned horsehide is cut very carefully to avoid thin or damaged areas as part of their obsessive quest to make a jacket that will last more than a lifetime. From the hand-cut horsehide pieces, one highly trained craftsman makes each jacket start-to-finish, moving from station to station with their work. 

Originally debuting in 1949, the J-31 is undoubtedly one of the most distinctive and unique leather jackets ever produced for the consumer market. Sharing the J-100's band collar, as well as the asymmetrical double-breasted fit (and epaulets) of the J-24 - the primary inspiration for the J-31 actually came from aviation jackets of the time.

The body is a custom vegetable-tanned horsehide, developed by The Real McCoy's to exacting specifications & designed to look and age exactly like the leather used on the original Buco jackets. Tanned and finished at Japan's famous Shinki Hikaku, it features a pigment finish that will wear down over time, revealing the brown core of the leather.

It's cut pretty true to size, with a broad chest and wide shoulders. The extremely asymmetrical cut works best while closed up, sealing you in from the wind. Lining the jacket is a wool houndstooth plaid fabric - soft, warm, and great for layering. Two welted handwarmer pockets sit above the waist, and the front of the jacket is lined with two rows of decorative DOT snap buttons, giving the jacket its iconic look.

Fits true to size. Do not wash.

  • Custom Shinki horsehide
  • Vegetable tanned with pigment finish
  • Black with brown tea-core
  • Wool houndstooth
  • Talon brass zippers
  • Two pockets
  • Band collar
  • Asymmetrical fit
  • Shoulder epaulets
  • Brass hardware
  • Internal and external snap belt loops
  • Made in Kobe, Japan
  • BJ21102

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All measurements are in inches.

Model Gen wears a size 40
Gen's sizing specs are:
6'1 and 180lbs
41" chest and 31" waist

Fits true to size. Do not wash.

Size Front Length Shoulder Chest Sleeve Length
38 24.25" 18.5" 41.5" 25"
40 24.75" 19.25" 43" 25.5"
42 25.75" 19.75" 44.5" 26"
44 26.5" 20.5" 47" 27"

Our Oakland and Santa Fe stores are open for cubside pickup. View our curbside pickup info.

Due to USPS service delays, we are shipping most USA orders via UPS Ground until further notice. If you prefer to have your order shipped with USPS, please contact us and we will do our best to accommodate you.

USA Orders

Bandanas, Patches, T-Shirts, Socks, & Hats - $5 via USPS First Class Mail
Curbside pickup: Free
Orders $300 and over - Free shipping via UPS Ground
Orders under $300 - $12 shipping via UPS Ground
Expedited Shipping (1 - 2 business days) via UPS - $40

International Orders

Canada Shipping - Orders under $400
USPS First Class (10 - 15 business days)  - $18
USPS Priority Mail (5 - 10 business days) - $35
DHL Express (2-3 business days) - $55

Canada Shipping - Orders over $400
DHL Express (1-3 business days) - $50

Rest of World Shipping
DHL Express (2-4 business days) - $55

We want you to be comfortable shopping with us online without being able to touch the product. Before you purchase, please check the size charts we provide against your favorite garments.

  • Exchanges or returns for store credit will be accepted on full-price items within 14 days of delivery (as verified by courier)
  • Items sold on sale or discount are final sale, no returns or exchanges.
  • Items must be in original condition with all tags attached.
  • Items that have been washed, hemmed, altered, excessively worn, set aflame or touched by a private equity firm cannot be returned.
  • All return and exchange shipping costs are your responsibility
  • We will process all returns within 3 business days of receipt
  • Our team will acknowledge receipt and action take with your return
  • Full terms and conditions are here.
  • If you have questions at any time you can reach us at or use our contact form, or phone us at 510-373-9696.