Burgess shotguns were only manufactured between 1892 and 1899. Total production may have been as low as a few thousand guns. Winchester bought out the patent rights but apparently never built any guns and the design ceased completely. The folding 19 1/2" barrel shotgun is considered by collectors to be the most valuable. But an engraved and unmolested original standard grade model would have substantial value. Estimating value without seeing the gun is like playing poker blindfolded, but I'd guess the range is anywhere from $2,500 to $5,000 on today's collector market. Please leave the patina alone and if you want to clean it just give it a good "bath" without removing any colors acquired through age.
