1926 (23rd Aug) cover flown by N. Vincent\\\'s Air Survey Co., to Port Sweetenham, endorsed and rubber-stamped in black \\\'BY AIR MAIL\\\', 4c Straits Settlement tied by code \\\"H\\\" 8 AM Singapore double-circle datestamp, \\\'TANGLIN/SINGAPORE\\\' code \\\"E\\\" sub-office datestamp alongside, \\\'PORT SWEETENHAM 12.30PM 23 AUG 26\\\' backstamp, minor adhesion on reverse not affecting this rare cover, (BEA.26.13bd – Believed only five known)