I believe this to be Sear 4925, but what RIC 285 variety? From what I understand, the bust shoulder is 285a. Is that correct?
I don't think it's Sear 4925. Did you check Wildwinds? The reverse has RELIG AVG IMP VI COS III. That would make it Sear 4926.
Yes, I'm positive that you're right, it is Sear 4926 it features Mercury and not Providentia. There are a couple versions of this one. See this Wildwinds page: http://www.wildwinds.com/coins/ric/marcus_aurelius/i.html Do you think this is RIC 285, Ric 298, or Ric 298var RSC 530e? I only ask because his bust seems to be the draped or cuirassed variety.