PMBM 747- Key+Combo Hybrid Lock
Here's a neat little lock that requires both a key and a combination to open. If you have only one of those, the lock will not open as it has two separate locking points on the shackle. I am not sure how old this lock is, but it is in good condition and I was told it was never used.
Here's a video of me doing a demo and then picking + decoding.