So just an update, I was able to email the author and got a quick reply back. Apparently he collects safety razors and is big into restorations. He gets trades for safety razors as payment sometimes and that's where the majority of that collection came from. So a shame that he isn't as passionate about straights as the rest of us but glad he decided to publish those for us. I haven't seen any other examples of some of those pieces online or anywhere else.