Ahhh! Good. We are in agreement then.
I don't think there's ever been any question about that. Scroll through the thread. I don't recall any pipe wrench with all the unmistakably prewar or wartime features having a bulge.
If they are wartime dates and not a decade later, yeah, it was either Ridge using up old stock, or people using parts interchangeably years and decades later, which is still very routine.
I don't look at the case of these wrenches - red frame (static jaw, housing and handle), slight bulge, patent number on handle, found with dynamic jaws and adjusting nuts that could also be wartime - as counting or discounting them so much as being more precise about what is being counted or discounted. What is the wrench when it has two parts? The dynamic jaw or the frame itself? Treating them as separate assemblies creates the least amount of conflict.
The red frames are postwar.
The dynamic jaws may be original to the frames and therefore with date codes that are postwar years.
The dynamic jaws may be wartime with wartime date codes.
That's safe and reasonable until we have more evidence, I think.