They were issued in time for the Korean War and continued to be issued up until the 1990s and used beyond that ..
There were some minor changes along the years, but the basic design has endured.
Early M51s were produced in much larger numbers than later examples . Latter types were issued on a limited basis to troops in Cold/Arctic zones..
Up first is an original M51 wool shirt that seems to have been issued but not worn. Unissued they would have a small white tag at the nape of the collar as seen in small photo.
The tags would be immediately removed by the new owner as they were real pains in the neck..
This other one has been worn for decades by me and remains one of my favorite cold weather pieces.
More to come ...