Gillette Old Type - Ball End. There should be a serial number on the comb, which could then be used to determine date. Some of them did come without serial numbers. I am not enough of an expert to know where those fall in the date range, but Old Types were sold from approx 1910 through sometime in the 1920's, when they were replaced by the New. Maybe 1922 or 1923 would be some of the last. I'd have to check Mr. razor or the Gillette serial number page, and I am too lazy right now. It's been a hell of a long day.
1929. I knew it. As soon as a number pops into my head, and I don't verify it....I'm usually wrong. Not sure why I had it in my head that 22' or 23' was the last year of the old type.