In article
, Stans4
@americanisp.net says...

It's interesting that this would have been cast aluminum back in 1918.

Why? Aluminum castings have been around a lot longer than that. Ever
see a Liberty engine crankcase casting? It was a WW-1 vintage
aircraft engine, a very elaborate casting. There was just no real
standardization of alloys like we have today.


Not a whole lot longer, at least not in commercial
quantities.

http://www.world-aluminium.org/history/index.html#

Ned Simmons