With the millions of razors that were produced, I'm sure they were many Monday morning razors that were slightly off in the grind. I don't know if they knew about tape for correcting the bevel angle in the old days, but I'm guessing they didn't. I've seen many old razors with no hone wear, but needed at least one or two layers of tape to get the edge popping. My guess is that once the original users couldn't get a good edge, the razor was placed aside and not used until this tape generation came along and could get it right. I've seen many wedges that had bevel angles all over the place. With the sheer numbers of razors that were produced, you can be sure there were defects. Just my two cents.