Dating late 1920's or 1930's, a Pictorial Review #3396 boy's trousers pattern.  The vintage sewing pattern is for a 6 year old.  Although evidence of damage of the envelope, the tissue paper pattern is very nice. Looks to be in almost unused condition. 

Printed tissue paper sheet with instruction included.  Envelope states this is a printed-perforated - cut out Pictograf.  All pattern pieces are accounted for. 

Size 6.  23" waist, 29" in seam.