Pictures would help a lot. I'll make a couple of SWAG's for you.
Henry will be Brand Value level three (BV3) I''l guess this is a mid-grade Jones under lever, Original Quality grade six (OQ6). The Current Condition level sounds like level two (CC2), "Limited use - slight finish wear, little shooting;" BV#-OQ6-CC2 = $3,100 with a 3X multiplier for hammer double rifles --- $9,300. If the CC level was actually level three (Minor repairs needed or proper restoration accomplished); BV1-OQ-CC3 = $2,300 X 3 = $6,900.
I have a strong suspicion that this gun is refinished. If so and a proper job was done, we would have BV3-OQ6-CC5 = $1,336 X 3 = $4000.
Be aware that there are very few true bargains in antique guns, esp. double rifles.
OK, what did it hammer for?
DDA