1990 Soviet Union, what kind of stamps are valuable?

1990, Soviet stamps are not very valuable.

I checked all the stamps of Soviet Union 1990, a set of stamps and five sheetlets/souvenir sheets.

The highest package price is 1990. 1. 18 "The Capital of the Soviet Union and its Joining Countries", the current price is around 20 yuan;

The highest price when a package is converted into a single ticket is the "Hundred Birds" fundraising stamp (attached ticket) 1990 issued on May 4. The full current price is about 15 yuan;

The highest price of a sheetlet/souvenir sheet is 190.2. 15, the world's first stamp 1 50th anniversary, and the current price is about 10 yuan.

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