The size tag has been removed, but measures like a current day men's large.  Flat lay measurements:

Armpit to armpit:  22"

Shoulder to shoulder:  20"

Shoulder to cuff:  25.5"

Length in back from nape of neck to bottom:  26"

Cream with bright stripes in red, green and blue.

Sweater is in great condition.  No rips, snags or stains.   It is a soft, medium weight knit that is comfortable to wear.