Styling looks mid 1850's to me. The motifs are very similar to my 1857 Englsih Frazier. I see a E L G in an oval, and the perron mark. There may be an inspectors mark - a single initial with a star over it - but I cannot tell from the photo. That started in 1853 as well.

The proof law of 1853 re-instituted the perron mark, according to my understanding of Wirnsberger, so the gun is post 1853.

Regards

GKT

Texas Declaration of Independence 1836 -The Indictment against the dictatorship, Para.16:"It has demanded us to deliver up our arms, which are essential to our defence, the rightful property of freemen, and formidable only to tyrannical governments."