It's an "indoor" day today and I was reading an older thread about the 4516 series and decided to head down to the shop and make some comparisons. Even though these pistols live together in the same safe, I've never set them side by side to compare them. For me, it was quite a surprise how similar they really are.
I have three 457 pistols and hold them in high regard. My 4513 is a TSW, and my 4516 an early no-dash. None of the three pictured here have much in the way of usage, the 4513 and 4516 both only have three or four magazines through 'em. The 457S is pretty much LNIB - though round count is uncertain. The 4516 and 457 seem to have the ability to share magazines with each other and the 4513 (sticking out the bottom of the grip). The 4513 mag in this case is exclusive for this gun (though might work in a CS45). I have found the 457 series a nice EDC.