This should be split into at least three types, with additional mintage lines.
Coin one:
KM# 168; Schön# 200.1; Schön# 200.2:
1986 PM Schön# 200.1
1987 PM Schön# 200.1
1987 PM Schön# 200.2; Statue of Liberty (New York International Numismatic Convention)
References:
KM published volumes or https://numismaster.com/MC_22859 (with a bad explanation of the third type)
Gerhard Schön; 2022. Weltmünzkatalog / 20. Jahrhundert: 1901-2000 (47. Auflage). Battenberg Gietl Verlag, Regenstauf, Germany. page 1329. (With a good explanation of the third type)
Coin two:
KM# 203; Schön# 648:
1988 PM
1988 PM
1990 PM
(There are also at several variations for different coin shows. Some are included under KM# 203 but Schön has different catalog numbers for each variation.)
References:
KM published volumes or https://numismaster.com/MC_22863
Gerhard Schön; 2022. Weltmünzkatalog / 20. Jahrhundert: 1901-2000 (47. Auflage). Battenberg Gietl Verlag, Regenstauf, Germany. page 1333.
Coin three:
KM# 717; Schön# 1731:
1996 PM
KM published volumes or https://numismaster.com/MC_22864
Gerhard Schön; 2022. Weltmünzkatalog / 20. Jahrhundert: 1901-2000 (47. Auflage). Battenberg Gietl Verlag, Regenstauf, Germany. page 1349