It looks like a circular object, which is common enough on this Thessalonica issue; though it makes no difference for the RIC number. The example...
not a book, but a two part series from the Celator-- http://community.vcoins.com/celator-vol-11-no-05/...
doucet posted some nice Constantinopolis coins, here is an unofficial "barb" example. [ATTACH] Circa A.D. 330- 335 16mm 2.7gm CONSTANT...
Here is a Gordian III with scalloped edges. Maybe used as a game piece or some kind of token. [ATTACH] Gordian III A.D. 241- 243 AE Sestertius...
I have this one that's 4" tall. [ATTACH]
please don't say his name two more times :) [ATTACH]
It from Lugdunum -- RIC VII Lyons 15 with F-T across fields. I seem to be able to make out the barest hint of an F in the right field.
Separate names with a comma.