*sigh* 'Tis indeed a thing of beauty......*drool*
The only way we can know for certain if the 2081 came with a VG brush roll is to determine the year that Hoover's beater bar patent ran out. I may be wrong with this, but Eureka had to wait until the patent ran out in order to bring their Vibra Groomer to market. If this was after 1971, then we know that the Vanguard originally came with only a classic Eureka Disturbulator. In fact, I am almost positive this is the case - Eureka always added the "Vibra Groomer" label on the hood of their uprights or power nozzles. The name appears no where on the Vanguard. I think the only Vanguard innovation was the Rugulator height adjuster. The Vibra Groomer came later on the 2072 and 2082 in 1973. I think that was the debut year.