W1AGI 1929 Newport, Rhode Island

His full name was William Christian Nielson. He had another call in 1931 -- W1CEI. Sometime later he got his W1AGI back.
In 1942 when he registered for the WWII draft he was employed by the U.S. Government at the U.S. Naval Torpedo Station, Newport, RI.
Silent Key February 22, 1887 - December 3, 1949.

Email received from Jim Hagerty WA1FFL:
Hi OM- I noticed a card by W1AGI- my grandfather! This is the only one in existence that I have seen. He died in 1949 and I never knew him. He never got a degree but taught himself electronics by building and taking courses at Brown University. He was also an expert golfer and swimmer and performed in musical theater!
The amazing thing is, not only did you have his card, it was one of his earliest- I think he went on the air about 1928-9. He worked a ZL with this station and I can scan it and send that to you as well- I still have the card. But your card is the only one I have seen that he himself sent out. I looked up that tube- a 210- and apparently many hams used the UX210 for 1-tube transmitters back then. I do know that he built a modulator in the early 1930's and ran about 160 watts input on phone.
73 and Many thanks- Jim WA1FFL

Here is the ZL card that Jim talked about:

QSL from the estate of W9ABB / W9HK
The W1AGI QSL of Jim's grandfather was mail to him to keep in January 2005.
Info courtesy of W5KNE
Email info courtesy of WA1FFL