That looks like the cylinder from my 1960s era Iver Johnson Trailsman 66. Despite two trips back to the factory, the timing was almost as bad as your example. When it still wouldn't fire reliably after the second trip, my dad finally let me trade it for a Ruger Single Six which is what I wanted in the first place.

OP, RdrBill's example shows a revolver badly out of time. For a .22 that isn't out of time, the peening would show up on the edges of the charge holes where the firing pin strikes the edge instead of the cartridge rim. While such peening can be cleaned up, it may interfere with the seating of the cartridge.

If you see a handgun with obvious pin strikes between the charge holes, as in RdrBill's picture, walk away and look for a better example.