new old stock., made in usa by seafarer believe it is 70's, educated guess. could be late 60's as chambray shirts where very popular for "counter culture " kids at that time. the weave of the chambray is old looking as they do not  usually make chambray that looks the same today . fabric is usa, and  made in usa. in the neck please note there is from cutting room inside neck not visible from outside and may wash out? are markings from cutting  room to know where to sew this piece on the shirt. marked small .  hand measure arm pit to arm pit 19.5" top of neck to bottom of shirt =30" in the front and 31" in the back.