this is twobit (Robert)
I'll take some photos of the areas you mentioned and email to you in a few days. My 92 is a W.R.A.C.O. serial number. I heard Sears, for a few years around 1895, ground them off because they undersold the Winchester agreed upon price. I've read descriptions of that, and also that the checkered pattern on the hammer can be traced to certain years as well as the barrel markings.
Here is an overall photo of the rifle