So I've been a straight razor guy for a while and just recently got back into DE razors. I picked this up at an antique store yesterday and cleaned it up a little. It shaved great. I'm just not sure what it is and I don't really know much about vintage DE's. It is a Gillette razor, with a "Made in Canada" stamp. At the bottom of the handle is says "Patented 1920". That the only markings on this razor. Can anyone shed some light onto what this razor is? I here take about Gillette Slims, Fattips, etc etc, can anyone tell me what this particular model is? Any way of dating this razor, and if so when was it made? Any help would be greatly appreciated. Pictures attached.