I recently found a spare Gillette safety razor I'd forgotten about, which I think I bought at a second-hand shop years ago for about $15. I've been using a Merkur safety razor for many years after my old Atra II died and all the then-current replacements looked like plasticky toys, so I went old school and have never looked back. Also use a brush and Proraso cream. (I think there was a thread on shaving earlier last year.)
After giving it a good cleaning and putting in a new Feather blade I found it was just as good as, if not better than my Merkur. It's slimmer and has good serrations on the handle, plus the adjustment has a click dial. And the iconic "butterfly doors" which open to change the blade
I got to thinking that it looked very much like the one I first started shaving with and wondered when it was made.
There are a number of websites devoted to these razors and it turns out they have a date code stamped into the base of the head where the shaft connects. From Razor Emporium, I found that mine was made in the first quarter of 1963, as the date code is I 1, the letter indicating the year and the number the quarter.
Despite being 60 years old, it looks brand new and works perfectly. I think they cost between $1.95 - $2.50 back then and I read that Gillette didn't make a lot of money on them, but made it up on the blades.
After giving it a good cleaning and putting in a new Feather blade I found it was just as good as, if not better than my Merkur. It's slimmer and has good serrations on the handle, plus the adjustment has a click dial. And the iconic "butterfly doors" which open to change the blade

I got to thinking that it looked very much like the one I first started shaving with and wondered when it was made.
There are a number of websites devoted to these razors and it turns out they have a date code stamped into the base of the head where the shaft connects. From Razor Emporium, I found that mine was made in the first quarter of 1963, as the date code is I 1, the letter indicating the year and the number the quarter.
"Gillette Date Codes were used from January 1951 until 2001. They are found in the top left and right corners on the underside of razor guards, both 3 peice and 1 piece models. The letter represents the year, found on the chart below, and the number 1-4 correspond with the quarter of the year." This one is from the beginning of 1958:
Mine was made two or three years before I began to shave. The one I had back then might have been my dad's, as I recall he latterly used a Phillips electric. 
Despite being 60 years old, it looks brand new and works perfectly. I think they cost between $1.95 - $2.50 back then and I read that Gillette didn't make a lot of money on them, but made it up on the blades.