Soviet coin 50 kopecks 1964-1991 coin value

The image of this coin is simply an example of Soviet coin 50 kopecks 1964-1991 type coinage.
Cost approximate and valid for common coin only (without rare varieties).
I do not buy or sell coins - this is just a catalog.

Union of Soviet Socialist Republics - USSR (1922-1991)
Monetary system - Ruble = 100 kopecks
Type - regular coinage
Copper-Nickel-Zinc
Diameter - 24.05 mm.
Weight - 4.5 gram
Years of minting
1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
Reverse:
Denomination in a wreath of ears
Legend: 50 КОПЕЕК (KOPEKS) year
Obverse:
State emblem of the USSR
Legend: СССР (USSR)
Edge - inscription ("50 КОПЕЕК" (KOPEKS) year)
Krause catalog number - Y#133a.2
Coin value of the coin in the condition "UNC"
1964, 1966, 1968, 1969, 1974, 1977, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988 - <$1
1965, 1972, 1973, 1989, 1990 - 6-8 USD
1967, 1975, 1976 - 15-20 USD
1970, 1971 - 10-15 USD
1991 - 1-2 USD