An unknown maker cut this "unique" puzzle in the Trenton, NJ area, probably in early 1934, the dates of the Trenton Times newspapers in which it was packed and sealed for 60 years. It, includes 50 figure pieces but no color line cutting. The maker devised an ingenious way to make the puzzle truly interlocking (i.e.can be pulled across table when assembled) by using a special saw to cut the puzzle into manageable sections which interlock with each other by large multi-piece "knobs". See photo. Most puzzles above 1000 pieces, and any puzzle as large or larger than this one, are cut into sections by crooked lines but do not interlock between sections because the "throat" of the scroll saw is not deep enough to allow the wood to be turned for cutting knobs.
Because of its huge size, this puzzle was very difficult to photograph. It's box was an old, sturdy laundry box with a hand written label on the outside giving only title and number of pieces. I displayed this puzzle in "Show & Tell" at the 15th Virtual Puzzle Parley July 2021. We have identified a jigsaw puzzle maker in Trenton, NJ in the 1930's (R.J. Lawrence of De Luxe Puzzles) but the cutting style is very different from that employed in Rome Coliseum.
The frame which I built with a plexiglass front and plywood back comes with the puzzle but presents a challenge on shipping. Obviously, driving to Worcester to pick up puzzle in its frame is the best way to ship it. But the vehicle must be large enough to hold an object approximately 5.5' x 3.5'. Shipping by commercial carrier presents a packing challenge. And will be costly with the buyer paying the carrier's charges. I will work with the buyer to figure out the best, safest and cheapest shipping method. This puzzle comes close to "unique"; I have seen larger puzzles but they are extremely rare.