More thoughts on why Pils razor were blamed for rusting: unlike the clamping method in popular DE razors, the Pils clamps between two flat plates, bevelled at the edges. The cap has end pieces. Apart from an exceedingly good shave, this results in very large contact areas, top and bottom, between the blade and the razor and thuis contact takes place in an environment that receives very little, if any, air circulation/venting. Add water to those large, unvented contact areas and leave on a bathroom shelf for a length of time and the result must inevitably be corrosion of the cheaper steel - the blade. Because of the design, good hygiene is even more necessary with a Pils razor than any other.
This quote is from an ebay item description about an Ikon razor: "Hand crafted 3 piece Stainless Steel. Will not suffer plate loss, no moving parts to wear or break, will not rust (in normal use & care)." The inference being .......