ID This Marcus Aurelius Denarius

Do you know the seller or was it random on ebay? In many instances just knowing the reputation of the seller can make all the difference. That's not to say that even reputable dealers can't make mistakes. Also, on Forum there is a list of notorious sellers of fakes you might want to check out. If you care to ID the seller, some of us here may know the seller and can either vouch for them or against them.

I have a couple of coins in my collection that are listed as "Not In RIC", so this would not be out of the ordinary. I have a denarius of Marcus Aurelius I have attributed at RIC 67 (looks much like your coin BTW), and it is only 17mm and weighs in at 2.6g. So your coin may not be too small. Too bad you don't have scales, but can you measure it?

Here is my coin:

Not sure if posting ebay profiles is allowed or not, if not please excuse this.

The seller was claudius43. He had several other listings at the time I purchased the coin and has a good profile rating. Typically I will not buy from someone with anything less than 100% rating. Here is his public profile:
http://myworld.ebay.com/claudius43

The dimensions are:
left-to-right diameter is ~17.78mm and its top-to-bottom diameter is ~15.24mm.

I was pretty concerned about it when I first got it due to the diameter and its "oval" like shape. But my concerns were alleviated slightly when I saw the split flans on the side and a good looking interior. I compared it to several reference images in the helpful reference "WRONG IS MY penny?":
http://www.tesorillo.com/fakes/index.htm