The original post may just have had DE razors in mind, but didn't say so. Some of my favorites were either made before the first world war (Gem Junior Bar, Kampfe SCS Lather Catcher), or designed before it (Gem 1912). Injectors came around a bit later, but the early repeaters (late 1920s through early 30s) and the E1, around 1935 are all excellent.
I guess my favorite DEs are mostly from later than that, but the 1930s Gillette New is a reliable standby.
Oh, about the OP's question on combs. You'll find debates on the pros and cons of an open comb design, but one suggestion I've read is that the closed guard bars were less expensive to make. Don't know if that's true, or if it contributed to the decrease in OC models, but it seems plausible.
Last edited by Slivovitz; 01-07-2012 at 04:58 AM.
"...when I attempt a discourse the words come out as they will, and they may make sense when they strike the atmosphere, or they may not." O.Henry - - "Cabbages and Kings"