The Koh-I-Noor Rapidomatic 5640 that I got in college (early to mid 1990’s) gets daily use. Some of the black coating is earing off, revealing the brass underneath. The pencil is significantly heavy and I like it but on occasion I’ve handed it over to people requesting the use of a pencil and the reaction is always “What the heck? What is this??” 
This Rotring 600 appears to be identical.
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