black box filarmonica

I have 6 Razors and the filarmonica is by far the best. (and i have good ones) Recently I purchase another nos filarmonica but the black box one. It have nothing to do with my white box one. The finish of the box and the razor is realy bad. Seeing against light the blade have a lot of imperfections. When i put it on the stone, it "kiks" ! I took a lot to me to set the bevel. It makes mi think that there is a filarmonica production before some date and after some date. Keep away from the black box filarmonica.