Description - Blue "P-38" sweater from 1943 that was very well documented. 

as described in some of the ads I found all from 1943:

"The Jantzen P-38 sweater features as authentic design of the fastest, fiercest fighter jet in the air! An all-wool, all purpose sweater knitted in an exclusive Jantzen stitch to give you a sturdy, warm sport sweater"

"Jantzen's 'P-38' is an authentic and exclusive design. One of hte outstanding winter sports sweaters of the year. 100% virgin wool yarn. Luxuriously warm and rugged"

Details

Brand - Jantzen

Content - Wool

Size - labeled Size 40, approximately a modern Men's Medium but please check all measurements to ensure fit 

Shoulders - 17" across

Chest - 20" pit to pit, stretches to 23"

Waist - 11" across, stretches to 18"

Length - 24"

Sleeves - 24" from shoulder seam uncuffed. 

Condition - There are numerous holes and stains and a few old mends. There underarms are a little fuzzy. Please look through the photos. I tried to document all of the flaws I saw but I could have missed small ones. It is definitely not perfect but it is very wearable! I am selling this as found because I do not feel comfortable washing it so the staining could possibly come out.