This Gillette Tech razor was made for about 30 years in various countries using various materials, as far as we can tell there are no set rules on how, who, and where, what materials were used with certain models, so I'll simply judge by weight and visual observation and give as accurate a description as I can.
This Tech (no date code) is USA made and nickel plating that is in good condition, the cap seems to be copper, the base plate pressed steel with the handle in brass. The nickel finished ones seems to be harder to find, and this one still looks pretty good.
The razors weighs 59 grams and stand 82 mm high.