Y54VA 1991 Federal Republic of Germany
Notice the crossed out part of the country in front of the card and any reference to GDR in the reverse side. Horst Volkmann must not have been reissued a reunified Germany callsign yet.
Info from Horst: First callsign was DM4WZA (1976-1979), Y54VA (1980-1991), DL1SWG (1991-1995), DK3GG from 1995 until now...
Courtesy of KB4SAD