What year this Dial A Matic Power Drive was manufactured?

[gj3476]

So I was window shopping on eBay and saw this really nice brown Hoover Dial A Matic Power Drive and really wish I buy it but not now. I seen these before and I was curious what years did Hoover made this model?

 

[kirbyvertibles]

late 70s

 

[TheSpiritOf76]

1974- 1975

It actually matched the first TOL straight suction Celebrity Custom.