Envelope, 1929, 5¢ blue, size 13, knife 78, watermark 33, bearing 1925, 5¢ blue tied by "San Juan P.R., Jul 17 1935" machine cancel and addressed to San Francisco Cal., preprinted Mendez & Co. San Juan return address; minor wrinkle, F.-V.F. and scarce used entire, This entire was issued for use in Puerto Rico, St. Thomas and Virgin Islands. UPSS No. AM4-33 $500. Scott No. UC1 var.  $750. $0 (Image)