Those Daisy powerlines develop leaky valve bodies pretty easy but the fix is simple. If you ever have that problem check out the youtube videos.
I've rebuilt several Crosman 38T revolvers in the past few years. I have two in .22 caliber, one is an early model with machined brass valve body and steel cylinder, and three in .177, plus enough parts to restore a 38C with brass valve body and steel cylinder in .22.
I have an 1851 Navy replica in .36 caliber. My older brother had an original Colt Navy his son gave to him years ago. I suppose his son has it now.
I also have a cut down (3" barrel) pocket version of the Confederate Colt copy in .44 caliber.