For those of you really anal about authenticity like myself, my good friend JIm Thorpe up in Idaho is making real Tobin Bronze prop shafts. They even come with a Certificate of Authenticity. Nearly all Chris-Craft runabouts came from the factory with Tobin Bronze shafts. Warning, they cost four times what a stainless shaft runs.
Jim is also taking orders for White Brass (a.k.a. German Nickel Silver) 1 1/8" rub rail.
Used by most boat manufacturers (including Chris-Craft) from the mid 1920s through approximatley 1932, this is the genuine article.
Buffalo Metal Works