Smith693,
I am not sure there is a way to check Remington revolver SS#'s to a dated of production. There maybe a few during ACW production.
However, the New Model 1863 Army revolvers were manufactured from 1863 until 1875 with about 155,000 (+) being produced during that time.
Do you know where the actual SS#'s maybe found, once you have this revolver cleaned up? I will offer what help I can if you would like.
My best,
Blair