Remington Model 1885/1887 (16 Gauge)

[aaronhuyser]

I have a double barrel shotgun that I just received from Grandpa's recent passing of 93 years old. From what I can come up with it's a Remington 1885-87. I know it's really not worth much. I've included some pictures. It's missing the Right Side hammer and if possible I would like to source a replacement. Any further info and or guidance ya'll can give me to point me in the right direction regarding parts would be amazing. I'm having trouble finding parts. The Big ticket part I'm looking for is obviously the right side hammer.
This is a 16 Gauge