Airmail Envelopes, 1929, 5¢ blue, die 2, die 2, size 13, knife 78, watermark 33, bearing 1925, 5¢ blue tied by "San Juan P.R., Jun 1 1934" duplex and addressed to San Francisco Cal., preprinted Mendez & Co. San Juan return address in border blue; small edge nick at top, F.-V.F. and rare used entire, This entire was issued for use in Puerto Rico, St. Thomas and Virgin Islands. Scott No. UC2 var. UPSS No. AM9-33  $750. $0 (Image)