I agree, it is very probably a Systron Donner 6053, 3 GHz, nixie.
Specs and (bad) pictures scanned from the manual on my server in
http://www.spinelectronics.eu/ftp/SD6053.pdf
I bet it comes from some remains of John's Radio stock - I remember
seeing many of them there, 15 years ago.
73 - Marco IK1ODO
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