I used to be a real snob with my Rotring pencils, original brass.
When starting this job, was worried about things going missing. Bought a Rotring Tikky. It is plastic. Just plastic.
However, it looks right. Works brilliantly, the grip is good. Being light is good, because it gets carted about in my shirt pocket from meeting to meeting.
They are damn fine pencils for the money.
The distressed (by me) Rotring 600 dates back to my school days.
I milled a 3mm slot in opposite sides of the hex barrel so that you could see how much lead was left.
In practice, this didn't work, as the plastic tube which contained the lead was covered in graphite dust - and you couldn't see what was in there.
The silver one is from the late 80's early 90's.
I put it in a lathe and made it around 11mm shorter - so that it would fit into a particular wallet.
I'm happy to report that these days, I'm getting out much more.
ETA - Oh, and the top cap on the 600 is not Rotring, it is from a Staedtler, which is much more pleasing, aesthetically.