https://rpc.ashmus.ox.ac.uk/countermark/850 

GIC 729

XF or X or X̅

rectangular 

uncertain 

Uncertain (Uncertain)

As 729i, 729ii, 729iii. May have been applied at Jerusalem, where the legion was left by Titus after the Jewish war. Uncertain size as no proper image (otherwise allocated to 729i, 729ii or 729iii