I am so sorry that I sent you on a wild goose chase, it now looks like your prop is correct.
We used to call that type of straight back blades 'cleaver' type props, originally they were designed to help eradicate cavitation and aeration in props that were running close to or even piercing the surface of the water. It now seems, that since my time, this type of blade has become the normal sort of blade shape.
BTW, these are about the best props you can buy, lost wax cast in bronze or stainless, fully balanced and polished. These were only just starting when I gave up model steam boats, but even then, if you were willing to wait while they were made and pay the money, they were definitely worth waiting a few weeks for.
The ones I used to make and buy from Raboesch were straight fronted.
A sign of modern times I suppose.