Picked up this razor set at a sale and have narrowed it down to the 40's but have been unable to get it any closer to a date. The blades are unopened (see pics) and the only markings are "pat.nos.on package" "reg.us patof?" gillette in triangle " madeinusa. on the blade holder. No markings on the handle which is non-magnetic. The plastic case has Gillette in triangle on top. Hope the pictures help Thanks Any info would be appreciated.