Hello, thank you for submitting these photos for appraisal.
You are correct that this pair of chairs dates to the 1870s, and the condition of the chairs appears to be very good, commensurate with age. The caning on the bottom of the seat(s) looks as though it may have been replaced, which is normal and does not negatively impact value.
I hope this information has been useful to you, and please let us know if we can be of additional assistance.