Don, you cant go wrong getting a "backup" Tamerlane. Your 1965 is an inviting challenge for guys like me. Bear bows marked as "DISPLAY" were marked that way because something was found on final inspection that rendered the bow unsuitable for sale. Unlike some other manufacturers, Bear didnt sell "seconds" or "Blems" at a discount. (Browning sold their "seconds" as "Deluxe Laminate Bows"). It could be anything from a blemish in the finish to structural problem that was unsafe to shoot. The DISPLAY bows were given by distributors to dealers, primarily dedicated sporting good /tackle store, to promote sales, as most small dealers couldnt afford to keep a handful of Tamerlanes hanging in the store. So, careful inspection will eventually reveal why it is marked DISPLAY.
The three screws in the riser look to be for mounting a clicker. No Bear dealer would display a 1965 Tamerlane appearing to shoot three arrows. So maybe the "never shot" story is in question, perhaps because the shooter discovered the flaw as the result of stringing the bow to shoot. I recently bought a Fasco Decathalon II, a target bow of the same sort as a Tamerlane, and the first time I strung and shot it I noticed a fine vertical crack from the grip through the shelf and up into the sight window opening up under the stress....it is impossible to find with the bow unstrung. Some Loctite 420 and clamping for a few hours and that bow is stronger than new.
You will have difficulty getting a decent price for a Bear bow marked display as everyone will assume it is a structural weakness. Find the problem, fix it as needed and shoot that bow like you made it yourself!
Mark