Used stamps exchanges.

I collect worldwide stamps used or mint:
1- overprinted stamps --> https://overprintedstamps.wordpress.com
2- classic - colonies
3- joint - twin issues
4- UN, UNICEF, UNESCO, FAO, WHO, ITU, UPU, WMO, Rotary, Lions, Red Cross, Olympic Games
5- maxi cards and prepaid cards
- https://mymaxicard.blogspot.com/
- https://myprepaidcards.blogspot.com/

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