Stamps issued on the first day of the SAR were changing hands for more than 10 times their value after post offices closed yesterday. Hawkers outside the General Post Office were selling commemorative envelopes bearing stamps and July 1, 1997 postmarks for up to $40 - compared with their face value of $2.30 to $3.60. Five-dollar sheets were selling for $10 to $100. The hawkers, who dodged hawker-control officers from the Urban Services Department to make their sales, were reluctant to be identified, but some said they started queuing at 3 am yesterday. Stamp collector Mak Yiu-kee said he was buying for mainland friends who wanted stamps with a chop from the Gloucester Road Post Office, because it was near the handover ceremony. He started queueing early yesterday.