From the personal collection of record cosmonaut Gennady Padalka :
Complete set of flags of all 6 countries that were involved in expedition 43/44 - frist time 6 nations were in space working together onboard the ISS at the same time !
Each flag is postmarked onboard the ISS and certified by Gennady Padalka in his own handwriting "Flown on ISS".
Japanese, Danish, Italian and Kasach flags are handsigned by the astronaut !
Only a handful of these sets were made and the last has been sold in Superior auctions many years ago at around $4000 !
A piece of history !