This is a canopy bed or field bed. Thought to be of Massachusetts origin from Salem, Ipswich, or Portsmouth NH possisbly, from early 19th century. Headboard and footboard are maple, rails are oak, posts are part maple part mahogany. All 4 finials are intact. Rosettes are not all intact. Canopy frame is there, but had been repaired. Mattress is held be large metal brackets. There are holes in the frame indicating it may have been a rope bed.
As I undertsand it, this is a field bed made to be moved easily. As such, the places where the rails and boards meet are marked with matching Roman numerals, which are believed to be original.
The size is between twin and full.
The bed "key" is marked by the Israel Sack gallery, formerly of NYC, which may have sold the bed at some point.
I also have a mattress/box spring made for this custom size, and a canopy.