I'm not sure a true paint code exists, but I bought Interior paint from Jim Carter. Turns out it was quite a bit darker than the concealed portions of the original speaker grille. I was able to have it lightened to match, but of course don't have a "code" for that as it was custom matched.
But here's a chip with a TCP Global code on it for 1951, which should be the same as your 1950. I would go with the lighter color of the two shown.
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1951-Chevrolettruck-pg09.jpg (29.16 KB, 106 downloads)
1951 Interior paint code


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.