The three instances listed in the catalogue at post #6 are these:
1. ☧ ἑκατόνταρχία (hekatóntarkhos, hekatontarchés) centurion .... R.A. 1903 B, 437
2. ☧ ἑκατόνταρχης (hekatóntarkhos, hekatontarchés) centurion.... W 2532 (177-80)
3. ☧ ἑκατόνταχους (hekatóntarkhos, hekatontarchés) centurion .... SARD 17
I have not yet been able to look these up and determine where they are in the empire, although the 2nd one is dated (177-80).
From the bibliography ...
R.A. = Revue Achaeologique
W = Waddington, W.H. ........ Paris 1870
SARD = Sardis, Vol VII ....... 1932
If you or anyone can find images of these, or further information about these three examples, it would be greatly appreciated.