Riser wood on the 61's wasn't fully dried and caused the glass to stress crack as it dried.. many were sent back for repair and ended up being painted to cover the cracks. Then they where star stamped and or the ser number removed to indicate they were no longer under warranty. Not sure if the Display where unshootable or if they where just bows that had been returned and the original owner wanted something else and were unsellable.. 63 Dog legs Type1's had holes drilled in them and then marked "Display"
I have a 61 Kodiak that is full of stress cracks, star stamped and no ser, number but it shoots great.
If the KM passes visual inspection, I would shoot it