http://www.ebay.com/itm/271423336178
This vintage hunting coat was made in Woolrich, Pennsylvania in the early 1930s by John Rich / Woolrich Woolen Mills. The 503 style hunting coat as been around with relatively few changes for the better part of a century, but the details make it easy to date. This is the earliest version of this coat I have seen.

While many Woolrich labels look relatively similar in isolation, the company changed their design every few years. This label was used in the very early 1930s. See the dating guide I have put together at the end of the auction. The snaps in this coat are by United Carr, and are a design only used from about 1930-1934. The top of the snap, with its line design, was used by Woolrich until about 1940. They switched to plain headed snaps during WWII, then to Woolrich branded snaps after the war. These early coats have asymmetrical breast pockets, while starting in the late 1950s, Woolrich switched to matching breast pockets. The brown buttons on this early coat are nicer than the red bakelite buttons which Woolrich began to use in the mid 1930s, which has a tendency to craze and crack over time.

Chest (pit to pit): 25″
Shoulder to shoulder: 20″
Sleeve (shoulder to cuff): 25″
Length (base of collar to hem): 28″