I 'm wondering which VN stamp's collections Sorin would like to exchange? If you can list them out, so all members can know and joint in.
I support some link about Vietnam stamp collection index we can base on (sorry only VN version - but I see you can note down many interested information):
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Natural index link
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Art index link
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Flowers index link
CTO or Live is ok? As FDC's and MC's ?
Regards.