The Mascot with its stepped-down back and incised lines on a rounded top shows elements of Art Deco moving towards the mid-century modern look. It comes from a 1949 design by Max Schlenker, began production in 1954 and was produced until 1957. They came in Ivory, Green and Maroon cases which were probably Plaskon, an early thermoplastic of the era.

The movement was mounted in a rubber grommeted frame for quiet operation. Here is the brass movement still in its frame, with the back bell removed.

The front view shows the three screws passing through washers and rubber grommets that hold the frame.

This grommeted cushioning was used in several Westclox of the era, both windup and electric. In electric clocks the heat produced often broke down the rubber grommets, but suitable replacements can be sourced from industrial supply shops.

The front wheel and spring washer sit loosely on the assembly and are easily lost if you aren't careful. The three frame screws and the three back bell screws look similar but are different sizes and it is important to keep them separate, as the bell screws will fit the frame but not vice versa.

The metal dial backer has tabs that bend over the frame. These are easily broken. 

The bezel has tabs that bend over the back and hold the glass and the paper dial in place.

Don't forget to attach the back bell before putting the movement back in the case.

The felted bottom has tabs that fit up under the bottom two screws on the case back and should be fit in before those screws are attached.

Case back with screws and winders in place.