As my mother would say, "Isn't that a bit excessive?" I got these from a garage that has lots of mechanics tools and woodworking tools. Other than being so shiny, they look like regular hammers to me. Do you know what these are used for?
The business ends might give an idea if they had ever been used. You may have discovered Maxwell's silver hammer.
A magnet sticks to them. Each has either the name or the initials of the former owner on it. There are no makers' marks.
The one at the bottom is a standard claw hammer the next a riveting hammer above that is a ball- peen hammer, again for metal working and the top is a mallet
Sometimes I bring a mallet to discuss my transaction with the self serve check out at the grocers... The ATM too. I typically get an immediate reaction....
They may well be stainless steel but it is possible to get tool steel this shiny fairly easily. I did it while learning about media blasting. I blasted a some old tool heads with garnet grit. Way overdid it and it left them looking a sickly gray color. I hit them with a wire brush in an angle grinder. With very little effort they shine like mirrors. Not really the sort of thing for antique tools, but they'd look pretty jazzy in a shop.