The gift he would choose himself. At least if this Australian 1950 advertisement is to be believed.
From the 25 November 1950 edition of Australian Women’s Weekly.
When making up your Christmas list, pan to give your man a new Gillette Razor Set … give him shaving comfort for life. The famous Gillette “Aristocrat” ONE-PIECE is the finest razor ever devised for the handiest, easiest, fastest shaves. With it, blades are changed like magic. TWIST – the razor opens! In goes the blade! TWIST again – it’s ready for use. There are no loose parets to assemble or mislay.
I don’t know how well the Gillette butterfly style work but I’m using a Gillette from 1929 I think with the three parts that you have to disassemble each time and it works so much better than the butterfly styles I was using before, but, those were cheap ones, I’m sure the Gillette is better.