I had one of that brand, also with ivory scales. If it is vintage and made in Sweden it is a good shaver IME. I was also following that but decided $ before more razors. Sacrilege , I know ..... You asked about why a 3 razor set. IMHO, because it was more affordable for the average buyer than a 7 day set. Engstrom wasn't the only one who made 3 and 4 razor sets. Enjoy it, you got a good deal.