Silver Roman Denarius [решено]

Hi can anyone please ID this silver Roman Denarius? The coin is in pretty bad condition (especially the reverse) and the photos therefore aren't that great. The diameter is 19mm. Thanks.

Caracalla, Rome mint, AR Denarius, IMP CAES M AVR ANTON AVG, laureate and draped bust right / SECVRIT ORBIS, Securitas seated right, hand raised, holding staff, altar before, RIC 22. Search for RIC 22 here: http://www.wildwinds.com/coins/ric/caracalla/t.html

This is really helpful (again), thank you for the ID and link. I'm going to try and improve the pics (maybe by investing in a lightbox).

You're welcome but I messed up, it's RIC 92 not RIC 22, use the same link as before but search for RIC 92

Thanks very much for the correction - the coin is in pretty bad condition so I didn't notice. I'll be posting a possible silver radiate tomorrow, it's condition is much worse :)