Celticstoneman
40 Cal
Red Owl,I've done quite a bit of research on old pocket/folding knives and when you get into the pre-1840 era the surviving knives with sound documentation become very rare. I've also seen knives actually made around 1920 that from their condition look like they must have been made in the 1700's. SO....don't be disappointed if the knife isn't as old as hoped. See if you can get in touch with someone in Sheffield. There was a woman there, a college professor, that maintained a lot of the old records. All the stamp marks are there, in a vault.
There are collections at Valley Forge, etc. with pruning knives from the 1920's that are claimed to be Revolutionary War era artifacts. People GET MAD when you ask for the documentation verifying the age, in many instances- there isn't any.
The square tang on your knife- generally the better builders used a square tang as it required more skill to get the blade to open and close correctly. It looks like the bolsters are attached to the liners, not integral. Sheet metal for liners were not that common until after ABOUT 1840-1850 when manufacturing could produce affordable sheet metal, before that a lot of knives had integral bolsters/liners.. BUT nothing is etched in stone- I'm speaking in general terms.
You have a rare find, well worth the effort to research.
Very well put. Thank you.
John