My Snap-On version. reversible ratchet portion, stencil says S-9023-2
don't have the C-shaped attachment
https://www.freepatentsonline.com/1898121.pdf
Here is a complete set, photo credit to Garage Journal
'OHV Deluxe', I found this thread while trying to find info on my Weidenhoff #895 external shunt.
Attached is page 20-21 from Weidenhoff Catalog #41 (April 1931) featuring your machine: the #940 Distributer Synchronizing Fixture