If you have a grand piano, write its length in cm. If you have an upright piano, write its height with closed cover in cm.
Or any other specification, production number etc.. You can find it in upper part where tuning pins are (upright piano) or on iron plate (grand piano).
E. g. black high polish, black mate, satin (you can see veneers); is surface damaged?
Viennese, English.
PETROF company offers you a lending of an instrument free of charge.