The metal racquets are really good to look at, so I am glad they were made and finally ovetaken by materials which didn't ruin your elbow. I think that tennis elbow must be lower than ever before thanks to the new materials, but that is another thread.
Thought I would share with you this proto-type that arrived ex France and found on hard rubbish tip. It arrived in an ALLO (french aluminium auto company that also made wood racquets from early 1900's) It isn't branded, arrived without a grip and is loosely strung. I polished it up and my stringer had a extra long grip which worked.
Like the Pro-AM this is solid cast but the detail in the casting is truly amazing down to the curved string holes and indented frame to protect the strings.
Never seen another which would be circa 1945.