That's interesting info, and thank you. I actually have a WF-8, without an S anywhere to be found that is 9/32 drive
As it should be, Twertsy. The ratchets marked WF-8 are 9/32 drive.
The ratchets marked "WF-8" on the face plate of the head with an "S" on the flip side of the handle (early production) or "WF-8-S" on the handle panel along with the "v PLVMB v" logo (later production) are 1/4 drive.
The WF series does not include any other 1/4 drive pieces. No sockets, no extensions, no handles. To add a 1/4 drive ratchet to production, ostensibly to be used by USAAF mechanics using 1/4 drive sockets, extensions and handles made by other suppliers, Plomb modified the drive insert. All the other parts - including the face plate of the head marked "WF-8" - were re-used from the 9/32 drive production stock. To distinguish a 9/32 drive ratchet from a 1/4 drive ratchet - again, both marked "WF-8" on the face plate of the head - they crudely stamped an "S" on the back side, initially. Later, they stamped WF-8-S on the handle panel.
As a tangential note, this is very similar to how Snap-On entered into 1/4-drive production, in 1943, a year and a half before they made the 1/4-drive sockets, extensions, and other handles to go with the ratchet, modifying the drive plug insert to their 9/32 drive ratchet.
My ratchet above is an example of the later 1/4-drive production WF-8-S.
There are examples of the earlier 1/4 drive WF production WF-8-S floating around - with the WF-8 on the head, just like the 9/32 drive ratchet, and the "S" on the back side handle - but I don't have one.