Identical stoves are still manufactured today. It's not supposed to be a modern, efficient, rope-sealed door stove. In fact, it was intended to operate with the doors open, until the end of a period of use. It's a "Franklin stove", although not exactly Franklin's original design of 1742 (it didn't work). Franklin liked the heating ability of the recent German settlers' five-plate stoves, but he didn't like the fact that one couldn't see the fire. His design was a compromise, but was intended to be significantly more efficient than an open fireplace. David Rittenhouse improved Franklin's concept in 1772 so it would vent properly. He called it the "Rittenhouse Stove", which is still the same exact design as in Jeff's pic. Everyone calls it the Franklin stove to this day. It's almost impossible for most folks to be able to determine if one were manufactured 200 years ago or last year. They're still quite popular around these parts. If Jim were to make his comments to any Franklin stove owners in the city of Fluffia, PA or surrounding counties, I'm sure they would try to do him some bodily harm. If the masonry on the wall is consistently at least 3.5" thick, without a ventilated air space, the required clearance can be reduced by 33%.