CHAUTAUQUA Treadle sewing machine

I bought this piece at an estate auction, the woman that owned it was in her late 90's when she passed away. she was a retire school teacher from Clintonville, Pa.  She took immacualte care of all her belongings , you can see this by the attached photos.

I have all the accessories in its original box, i have the original instruction book, along with a correspondance typed what seems to be  on rice/wax paper about a sewing problem she was having. The manufacure replied and told her how to correct the problem.  I have no idea of its value nor history of the manufacture.

Good