Preowned but in excellent condition.  Estimated to be from the 60s.  No piques or holes.  Minor staining under white stripe near arm pit.  Could use a cleaning.  Some pilling in spots but is normal for these type sweaters.  Please see pictures for condition and measurements.  This shirt does not have a tag to tell the maker, size, or material.  Based off of the measurements below, i'd put it into a medium.

APPROXIMATE MEASUREMENTS-

Nap of neck to bottom of sweater:  23"

Armpit to armpit across back:  21"

Arm measurement:  33"