I'm going to break protocol here to post a second time immediately. I looked into the company that calls itself both American Excellence (no relation to the manufacturer), ModelCarWorld, and ModelCarWorldUSA.
The actual company is ModelCarWorld GmBH located at Bottgerstr 14, 65439 Floersheim, Germany - in Weisbaden, about 80 miles east of Luxemboug. When they sell on Amazon US they use the company name ModelCarWorldUSA. Their US distribution company is actually called American Excellence Trading Co., and is at 12290 Treeline Avene, Ft. Myers.
ModelCarWorldUSA seems to be the largest retailer of 1:43 '50s and 60's cars on Amazon, with well over half the listings in the 1950s period. They carry a big inventory of Neo, Spark, Matchbox, Franklin, Vitesse, American Excellence, Solido, Ertl - just about every company except Brooklin. Prices vary from very reasonable to ridiculously high and seem to bear no relation to product quality or rarity. Inventory turns over quickly - cars come and go nearly daily so I check them frequently.
Everything I have ordered arrives undamaged and exactly as represented. Shipping is expensive (about $12, which means it exceeds to cost of a few of their lower priced cars), but they discount it for multiple orders (six cars cost about $24 to ship, I think). Delivery is slow: never less than two and sometimes more than three weeks. Near as I can determine, their warehouse is in Germany and they hold and ship orders in large groups through customs to Ft. Myers and then repackage and send them on through domestic mail: everything I get is packed in Germany but it boxes labeled and mailed from Florida. Still, it could be worse, the Amazeon retailer calling itself CoolJapan takes nearly six weeks!