Can anyone identify the lower unit? It has no markings and is very similar to the Matco unit. I thought it might be an earlier version of the Matco unit but I am not sure.
Thats an interesting weld repair/support bracket added to the top one. Most Matcos are very heavy, and when dropped, they snap off the mag platform. That is why most have a weld/braze repair in that area.
Id still like to know who made the second front plate. Surely someone out there must have a clue.
BTW: Lurkers answers are welcome too!
Your second unmarked one may have the wrong gear wired to it. The casting appears to have a hub machined in it for the camshaft gear to rotate on. Colombo drives are made this way, although Colombo drives seem to have a large oil filler.
As for the lettering on the Matco, some of this style say Splitdorf.
I do know someone that has a Columbo unit on his car. Layden B knows him also. I do not know the unit well enough to say whether that is like it or not. I know American Bosch also made a cross drive, but I don't think that one is a Bosch. However, I could be wrong. They may have made more than one style. The Bosch units I have seen all had "Bosch" prominently cast on them.
Ed, you out there?
Drive carefully, and enjoy, W2
Here are some similar things in a 1927 UK catalogue (lent to me by Neil Tuckett).
In 1927, £1 was about $5.
(I've cropped the page and lowered the resolution to meet the size requirement)