Ok all I promise this will be the last one in a while as I have to break this RAD quickly as I have acquired 13 razors this month and for the most part I was able to date code them but the last one to come in which happens to be a black beauty is also presenting a bit of a mystery to me. I was sold it via auction as a 1977 "or so" vintage model. I can tell you this much and provide pictures for the rest and this is odd to me. The handle is definitely metal covered by black paint and is not plastic like some of the 80's models but, the under part of the head where the adjustment knob meets the head it is most definitely plastic. Is this indeed a 1977 and was a transitional piece between 1970's version to the 80's all plastic version ? while we are at it any thoughts on this specific model any cleaning tips ie. no scrubbing bubbles, no alcohol , no barbacide, I would automatically assume no boiling water. So for the info I can provide that is not in the pics inside the TTO it says PAT NOS on PKG ....... the handle is metal the TTO is metal but the under carriage is a thicker plastic matte finish. here are some pictures .... sprrry for so many I figured the more I could provide the easier the identification would be.