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Any markings to determine the quality of the "movement" (or the actual workings of the watch) will be stamped on the movement.
In pocket watches, the case and the movement almost never have anything to do with each other.
If there is only one "fine line of separation", that between the bezel and the body of the case, then your case is a "Swing-out" case and the back will not screw off (see below).
To unscrew the back of a Screw back & Bezel case, hold the watch dial down in the palm of your left hand, with the winding stem, more properly called the pendant, up against your left thumb.
A case knife can be very helpful in opening many different watches. Unlike pocket watches that can be opened by hand, wrist watches have six notches around the edge of the case back.
They aren't sharp enough to cut you, but are designed with a nice rounded edge that makes opening a case a breeze, and won't damage or scratch the case of the watch. A special adjustable case wrench is required to open this type of case.
The bezel (which is the glass side of the case) and the back is threaded in place and literally screws right off.
Once the selection was made, the jeweler would piece the two together very easily, and the customer would be on their way home with their new watch.
This lip usually signifies where to pry with a case knife.
If a lip is present on the back or the bezel, then it is a "snap-on" and not screwed on.
This is why it is so important to open the case to see what we have.
You can't usually judge a watch by the exterior..can be deceiving.
Pocket watch and wrist watch cases have been designed in MANY MANY different ways.