I picked this one up today in a local thrift shop.
Hands down, this is the oldest Patagonia Capilene that I have come across in a thrift shop. Old school, Made in the USA, from back when Patagonia really was the king of the outdoors clothing industry.
The Wallace Beery styles from the olden days are still my favored shirt pattern for long underwear tops. I also have an expedition weight one from a few years later. I started getting into this stuff in the mid-1990s, and by then, Patagonia was only making this style in the Expedition Weight (now called Capilene 4).
Style #44251 -Midweight Capilene Wallace Beery -Navy Blue color -Men’s Medium
Catalog photos are from the Spring 1988 catalog