Original wood was European (aka French or Italian) walnut and the finish was satin or semi gloss. I use a satin finish on any of my cars and on the wood I sell. The high gloss might have been specified by the owner, I doubt that the Werk Shop would have specified it unless the owner wanted it that way. I have seen high gloss in many cars, even batmobiles but it is not correct. I am not certain but it also appears that later cars like 74-75 cars had a darker stain but still satin finish. Of course the grain was filled so none was visable. Early stain was something between walnut and cherry, a reddish brown, later appeared more brown and darker. Many, many coupes, especially the survivors mostly from the southwest and CA has sun bleached wood, you can see the original color by removing the door wood and at the top will be a thin length of darker wood, that was the original.
Scott, all that documentation you've accumulated, you thinking about buying that L? It is more accurate than most I see on ebay, altho there are glaring errors like the short ducktail which was only used with the wing and the wood panels on the shifter console, both easily rectified. Otherwise it looks pretty good. Don Detlefsen at the Werk Shop does some of the best work out there.