Question About Early Testing Models

I've been reading Patrick Foster's book "The Story of Jeep"
The chapter discussing the development of the Jeep for the Army states, "This final, standard version was dubbed the Willys MB. After a run of nearly 26,000 units, the grille design was revised yet again to the slotted grille stamping that's most familiar today."
My question is, how many Jeeps still exist that were made before this grille design change? Not just the jeeps apart of the 26,000 unit run, but everything before the design change. Pygmy's, Quad's, Bantam BRC-60's/BRC-40's, etc.
I saw a few at the 75th anniversary festival in Bantam a few years ago, but I was barely 14 years old then. I don't remember all that well.

 

Those early MB's are commonly referred to as "slat grilles". I have no idea how many remain today, but the folks on the G503 website may have some idea. The slat grille MBs are of course relatively rare compared to the later, and far more numerous, stamped-grille version. I believe more than 500k of the latter type of early Jeep, including both the Willys MB and the essentially identical Ford GPW, were manufactured by the end of WWII .