I did some nosing around on original finish on the Model 100.

Chuck Hawks seems to think original finish appears to have been lacquered. I don't know how much weight to give that.

http://www.chuckhawks.com/winchester_100_rifle.htm

This fellow left a phone number for selling his original finished 100. You might call and ask.

http://www.northwestfirearms.com/rifle-classifieds/101859-winchester-model-100-284-winchester.html

There also appears to be a Model 100 carbine restoration thread at The High Road, but I don't think their server is answering right now. Here's the link, FWIW.

www.thehighroad.org/archive/index.php/t-398493.html

Presumably you know about the firing pin recall referenced in this (you'll have to scroll down a bit)

http://www.wisnersinc.com/additional_info/winchesterl_88_100.htm

Don't know how much help this is.

What part of "shall not be infringed" do you not understand?