Sorry Jethro, but it looks fake to me too. Likely a cast counterfeit - mushy details on devices, the fields are grainy, and the denticles are horrible. It may actually be silver, but key date coins such as 1873-S Trade dollars are ripe for faking.
Compare yours to this 1873 that I pulled from ebay.

Compare yours to this 1873 that I pulled from ebay.

Inordinately fascinated by bits of metal with strange markings and figures


























