Type -A, -B, -D, & -F Examples
Until now, I have only seen the Model 1428 in white and blue; however eBay currently has a listing for what is supposedly a short-lived Type A with a Shadow-colored (dark brown) base instead along with the "hex key" graphic bag cover design rather than the common tattersall print—its plastic handle indicates at least a 1981 production. Given Eureka's propensity for updates & changes—including model color changes—I doubt that the model in the listing was mislabeled; albeit it's possible.
I was unable to detect other physical changes among Types -B, -D, & -F, so it may be that the differences were internal or subtle. Plastic v. metal parts, wheels, brush roll style, motor amps, or the cord are some prospects.
Newspaper marketing I located was from 1980-1989.
Photos—
1-4: eBay photos for 1428-A in White & Shadow (presumed color name based similarity to other models so identified)
5: Dec. 21, 1980 READING EAGLE newspaper ad - unidentified but matching many features of the brown 1428-A
6: Blue & White sales sheet (unidentified Type- presumably 'B', or were there 2 'A's?)
7: eBay 1428-D base in blue (ratings decal shows 4.0-amps)
Videos—
1. 1428-B on YouTube
2. 1428-F on YouTube
