My truck is Meadow Green up under the dash and looks very close to this.
Man that looks AWESOME! very soon I will be painting my cab the same!

 

We are redoing a 52. Original color meadow green. I forgot the computer monitor and headed down to NAPA and got a 1/2 Pint of Martin Senior Meadow Green/Acrylic enamel. Cost me $13.00
I compared it to hidden patch's and BINGO! 313/1323 paint code for Martin Senior.

It is a color that to me changes considerably when you look at it outside, in the garage under fluorescent light, and depending if on the grass or cement/ gravel. According to my monitor your old paint sample is very close.

 

My '51 has a farm repaint which is lighter and brighter than the oe color, like inside the cab. Since I plan to leave it as-is, I'm not sure of the newer color, but it seems like I saw a '52 color that looks a lot like mine. FWIW, as I understand it, you can use any color that the manufacturer used on a judged restoration. (My understanding, but it could be wrong).