KOREAN WAR USAF TYPE B-15B INTERMEDIATE FLYING JACKET FIRST PATTERN 3220-B Sz 36

Minimum wear on this item of 75 years. This second version of the nylon B15-B is specification 3220C (on the label), and appears to have been only ever manufactured by The Gardner Corporation, manufactured late 1949 to early 1950.

The first version of the nylon B-15B is specification 3220B, and there are at least two manufacturers that I have traced - Great Lakes Manufacturing, and Reed Products. The only difference (at least that I can see) between these two specifications is the size of the leather O2 tab.