Model Number A2M2070
Serial Number 007688
Made in U.S.A.
The back of the connector is
The thumbscrews are smooth and the ends are plain (no logo).
The ball is rubber.
NOTE: The case and connector appear to be identical to one
version of the M0100
with the exception that the connector is
stamped with 590-0055A.
I have a few of these, mixed between "Made
in Japan" and "Made in Malaysia" labels.