UPDATE: Brochure sold on eBay.
I spotted this 1960 Catalog from Berg’s Truck and Parts Company tonight. Hyman Berg, a Ukrainian by emigre, was possibly the first distributor of Willys Parts (though I have no information that definitively backs this claim). Mr. Berg founded the international truck and jeep parts company in the 1940s. In the 1950s, he founded Amsco Parts Co. Both were at 1608 S. Wabash, Chicago, Illinois. Apparently, JC Whitneys was right down the street from Bergs for some period of time. According to Berg’s grandson, the family was immersed in Marketing for decades, hence the decision by Hy to be known as the “King of Jeeps”.
In addition, as suggested by this G503 thread, Hy sold Sears Jeep parts and also sold Jeep parts to the Phillipines. He bought some early prototype jeeps and housed them at this same location, which is where this photograph was taken. There is more information about Berg here, too, from G503.
Hyman Berg died in 1986 at the age of 75.