Manley used three different types of popcorn kettles. The most unique of these kettles is the Vista Pop. Manley's Vista Pop kettle uses a Pyrex cylinder as part of the kettle. This was a marketing feature that allowed customers to see the popcorn popping. These Manley Vista Pop popcorn machines came in a variety of cabinets, and were identified with many different model numbers. A few of the Manley Vista Pop popcorn poppers are depicted below:
The above photo is of a Vista Pop machine on eBay, photo used with permission of seller. The following is a close-up of the kettle. Notice the Pyrex cylinder.
In the following video, you can see a Vista Pop dumping it popcorn. This occurs at approximately the 2:42 mark.
Manley Documents for Model 127
Operating Instructions for a Model 127
Seasoning Well--"old style"
Genuine Manley Wiring Diagram Model 127 from 1966.

Above image courtesy of forum member rbuchholz;
Model 67
The Model 67 Vista Pop photos are courtesy of Forum Member Jim. Please click on the following thumbnail photos for a larger photo.
Vista Pop Model 128 (click on the following thumbnails for a larger picture)
Photos courtesy of forum member Dan Kenkel
A retired Manley Vista Pop can be found on the following page--Curt's Theatre Inc. - Rolla ND (about half-way down the page)--it appears to have an all-plastic top.