Watch List notes:

THE ORDER OF ST. JOHN AT RHODES. PHILIBERT DE NAILLAC, 1396-1421. Gigliato. Grand Master kneeling before cross, his family arms in field, symbol I beneath cross, +F. PHIB. DE NEILHACO: MGRI Rv. Cross fleury with arms of the order at the ends, +HOSPITALI S: IOA(NES. IH)RL 3.76 g. Metc. 1219 var., Schlumb. X, 11 var., Beckenb. -.
Very fine

The symbol looks like the letter T, but the upper bar is one of the steps on which the cross stands. Ex Kunst und Münzen AG, Lugano, Listino 75, Sept. 2001, Nr. 1295. Bought from Byzantium Coins, Wolfgang Leimenstoll, Gundelfingen, in Oct. 2011.