C Claudius Pulcher, 110 - 109 BC
Silver Denarius, 19mm, 2.1 grams
Obverse:  Helmeted head of Roma right.
Reverse: Victory in Biga right, C PVLCHER in exergue.

Reference:
Claudia1  //  BMC1288  //  Crawford300/1  //  Syd569

Provenance:
Ebay, September 2008, $25

Notes:
While it is simply impossible to imagine what was going on in the persons mind who modified this coin, it would appear to be that they intended to make this coin into jewelry.  It is of course impossible to determine exactly when the coin was modified, but the patination within the cuts on the coin indicate that it was in ancient times.