Fisher wood stoves. Trying to find out if any fisher stoves came stock with top and back flues. I know some came with top or back but I found a grandma bear that has both top and back. It was done right and its been that way for a long time. Just not sure if that's a modification done by the first owner or something Fisher would have done as a custom order. Will this hurt the value of the stove? Thanks for any information.