Over the last 30 years I have accumulated a few A10's.
I have had two of the original (Mazak) housings fail (crack and break away) in the thinner drive spindle area.
Others have shown signs of the metal crumbling away.
Not surprising that a 70 year old material,that was specified more for cost saving, than metallurgical quality (ie material was cheap), suffers fatigue failure.
I work in the fluid power industry; the only application of this material in a gear pump I have ever seen, is by now defunct manufacturers of British motorcycles.
All of my machines have a replacement high quality pump: some SRM, some cast iron).
Richard