The 974 went in to "open faced" pocket watches while the 975 went into "hunter cased" watches. A hunter cased movement will have the seconds at a 3:00 position relative to the stem. It's sometimes called a "side winder" as the dial is rotated 90 degrees to keep the seconds at 6 position.
974 movements can be stem set or lever set. The latter would have a small lever at about the 2 position that you would pull out in order to set the time. A stem set, or pendant set, movement has springs inside that push the keyless works into the time setting position when you pull the stem out
Here's a nice example of a 974 pocket watch with a serial number dating to about 1920. It looks quite similar to the catalog image, except the dial doesn't have the 5 - 60 outer register. It's a very nice looking watch and is a nice size too, measuring in at almost 50mm in diameter.
The 974 is a typical-looking 3/4 plate movement. The regulator also has a micro regulator to move adjust the timing by means of turning a screw. This allows for very precise regulating of the hairspring.
It's not uncommon to find some means of personalization engraved on the case back. This watch also has a date engraved inside the case back. I'm sure this was a treasured watch for someone. The case is in excellent shape. The only gold loss is on the bow, where I presume a chain wore against it for decades.