I have a padlock that looks identical, except with a Master Lock brand. It is also stainless steel body and shackle and a captive cylinder. Master no longer sells it, from what I can tell.

The key on mine is odd. It does not use the edge to push the tumblers as on pretty much every pin-tumbler lock made, but has holes drilled in the side of the key blank, to the appropriate depth for the tumbler.

That lock was put through a garage fire. First intense heat, then lots of water. I had to apply extra force to get the shackle open the first time after retrieving the lock, but after that and some lubrication, it still works as good as new.