As I matter of fact, I do.
James GOLCHER was a well-respected gunmaker in the Philadelphia area from about 1840 until the end of the percussion era. He made mostly locks and not complete firearms, although some smaller-caliber Plains-type rifles were made.
I have incomplete research on the Eagle Gun Factory, but my belief is that Golcher would have been the lockmaker for the larger concern and not the muzzle-to-butt gunmaker. The marking you describe has appeared on various longarms including the 9-bore Pigeon Gun referenced in Xracer's link above.
The autonomic nervous system provides for involuntary muscle function - the work of breathing, digestion, and so forth. On some folks, that's a pure waste of ingenuity.