L.C. Smith Maker guns were listed as Quality A, English Twist, to Quality F, Finest Damascus or Laminated Steel.
The gun could be 140 years old, and should not be used, with any load, until it has been evaluated by a double gun specialist.
Please see "General Information" in the FAQs on the LCSCA site
https://lcsca.clubexpress.com/content.aspx?page_id=274&club_id=43784

Re: pattern welded quality and origin
https://docs.google.com/document/d/1YJxP1k3PzmtmrG1HEGxd8X6g0-1GL0KNY8WMIMkdKr0/edit