serial numbers and dates,,,
Yes, with Hoover products starting in late 1987 the date it was made is in the serial number, the first 4 digits are the month and year made.
With regards to Penncrest cleaners and people not knowing they were Hoovers, Penney's didn't even try to hide the fact their cleaners were re badged hoovers...their 1966 Catalog stated that their uprights "beat as they sweep as they clean"
Sheesh even Ray Charles could see it was a Hoover!