3alarmer

...I honestly do not remember, but if you have both a standard British threaded RH adjustable BB cup, and a French threaded adjustable BB cup, it's pretty simple to use them as a go/no go tool to see which one threads easily and fully into the freewheel. I keep one of each in my bicycle toolbox, for just this purpose. Otherwise, you need a thread gauge. I have one somewhere, but usually it's in an inconvenient place when I need to check this.

They will both start out into the freewheel, but the wrong one will start to jam up about three or four turns in. Don't force it, and make sure the threads are clean and oiled when you do it. If you get a cup stuck inside the freewheel, extricate it with something like a pump plier, with the jaws wrapped in rubber or electrical tape to protect the threading of your test cup.