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I would like to make the blade black like the one(s) in the film but I don't want to damage this as it's quite valuable.
I used cold blue, available at most gunshops. It's a chemical bluing. It will blacken the blade so if you don't want to lose collectability value of the Mk2, then you shouldn't do that. Too late for me. I bought my knife brand new in 1979 pre-Aliens (-7 PA

) and cold blued the blade. The serial number is 069165 which according to this site
Gerber Mk2 Date says it was manufactured in 1978. This is next to my Gerber Mk1 bought at the same time (blade also done). That serial number is 075773. I do believe the blades are made from L6 tool steel, which has very little corrosion resistance if at all. Keep your blade lightly oiled. If yours is made from stainless steel, (an "S" in the serial number), disregard the oiling.

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I did a few MK II resin knives.
Scott's resin knives rock! In face, they are cast from my knife.

Would be nice to see Scott make another run. Quality work.
I do believe the screen used Mk2's didn't have the sharpening steel & pouch unless someone can tell me different ~races to watch movie to confirm~
All in all, a nice addition to your collection, Paul.
Mike