Austrian cover

This Austrian cover has one nice stamp with really clear postmark. Cover was sent from Graz on 16th of July and it has stamp celebrating 50th anniversary of Österreichisches Freilichtmuseum Stübing, an open-air museum containing old farmhouses and farm buildings from all over Austria reassembled in historic setting, attached. Österreichisches Freilichtmuseum Stübing is also located near the city of Graz.
It took only 3 days to arrive to Estonia. Thank you!