I think this topic has been discussed before. M-B did not lavish great care on the finish of the wood on the 113. The really nice finishes were reserved for the big coupes and convertibles. The finish for the 113 was a couple coats of brown tinted laquer. This hid most of the grain visually, but the various depressions in the grain showed through the finish. It is impossible to reproduce an exact copy of the factory finish by staining and clearing (varnish, poly, etc.). The best you can accomplish is to come close in color. Most folks think the "clearer" finishes look prettier. My technique is to stain and follow with many, many coats of spar varnish, sanded carefully between coats, followed by hand rubbing with pumice and then rottenstone to get the desired gloss (or better stated "satin gloss").
Also, back "in the day", replacement wood pieces could be ordered without stating a chassis number or color, so I speculate that there were no wood choices.
Vince Canepa
1967 250SL
113.043-10-001543
568H Signal Red
116 Caviar MB-Tex