Here are some pictures of a very well preserved Irvin Air Chute jacket from the mid 1930s. It was most likely made before 1938 when IAC started to use 9 underarm vents on many of their jackets. It is made of a thinner close pile fleece and retains all the original polyacrilate coating on the skin side. Sadly the label is long gone. The zips are the rarer unmarked Dot nickel variety and the slider box is marked "Dot British". It is a very comfortable jacket to wear.