General Motors made their Old Look transit and suburban buses from 1941 to 1959 when they introduced the Fishbowl. Up to 1942 they were the Yellow Coach Division after 1942 they became GMC. Through WWII the windows were spaced evenly with square corners. after the war the windows were in pairs and curved corners The 35 passenger old look with square windows was continued until 1968.
FYI John D Hertz founded the Yellow Cab Co in Chicago. He later started the Yellow Manufacturing Co to Manufacture Taxi Cabs Then he created the Hertz Rent A Car Co.
General Moters gained control of Yellow Manufacturing Co in 1925 and Continued producing buses and started making trucks for GMC. .
A square window Yellow or GMC bus
A round cornered window GMC bus
A late '40s Fageol Twin Coach
I wish someone would produce these, They were common from the late'40s to the early '60s