Schwinn used Ovie Jensen to build Paramounts from just after the end of World War II to the mid-1950's. Ovie was a traditional builder using traditional techniques. Here is an example of a tourist Paramount from the late 1940's:

Framebuilding was labor intensive for a variety of reasons:

Builders generally worked without fixturing. To hold the frame together, they would prepare the lugs and tubes, fit the pieces together, drill holes in selected spots and screw or pin the frames together. Paramount builders used screws to provide extra mechanical support over simple pinning. After the frame was screwed together, the heads of the screws were ground off and the frame was brazed together.

Builders also hand filed the lugs starting with a basic lug blank. Lug carving not only provided an opportunity to show fine workmanship, it also lightened up the frame, reduced stresses at the joint and allowed fit-ups for different frame sizes. The large starting lugs required a lot of work and limited the framebuilders flexibility.

Below in an example of a carved "key hole" lug designs. The hole from which this lug style was named provided an important structural benefit insofar as it significantly reduced stresses at the joint (known today as a "stress riser"). In addition, the builder filed down the bulky base lug to a narrow thickness at the end of the lug:

The seat cluster on the left shows the classic ball-end style finish for the seatstay used by the Wastyns. The bottom bracket shell at right includes an lubrication port as well as a chainguard mount.

Few manufacturers produced quality lugs during this period since they were still recovering from the war. BSA (British Small Arms) produced many bicycle parts during this period, nearly monopolizing the high-end.

Below is an example of a rear dropout. Even tourist frames had what we would call "track" dropouts. It was likely outfitted with a three-speed hub. Not the fender and chainguard mounts: