Old ivory pieces recently engraved. This one (& a second offered by the same eBay dealer) are recent "fakes." Usually, it is easy to see that ivories have been re-engraved but these looked very old; couldn't id them nor find them on Rich Hanover's page and so I contacted my sources and both said, "fakes."

http://www.ebay.com/itm/ivory-poker-chip-1850-1880-5/171125895595?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D17847%26meid%3D1377658181672091556%26pid%3D100005%26prg%3D8208%26rk%3D3%26rkt%3D4%26sd%3D171125400504%26