What is value of palmetto arms company single shot 12 gauge breech load patented august 12 1913 with stamp 657 EE on it?

Have the 12 gauge, single shot palmetto arms co., electro steel choke bored, patented august 12 1913. It also has 2 other markings on it, 657 EE on barrell and in the chamber. Then on the small forward snap off stock is also is stamped in the wood 7 B 1, I read that is an indicator as to where and when it was made. What can you tell me about this weapon? Thank you so much for your time, Frank