Some recent China meters on Ebay:
China cover: Canton meter with Pinglam 6/8/49 postmark: $ 787.77
Canton meter in poor condition: $60.00
Cover with two Canton meter labels on reverse side; Canton 14/5/49: $ 810.00 (front and reverse side shown)
Cover with Canton meter and postmark Canton 24/8/49: $ 444.00