Doesn’t look US built.  Metric or Imperial hardware?  Maybe commercial marine?

From: [email protected] <[email protected]> On Behalf Of B. Smith
Sent: Monday, November 8, 2021 6:32 PM
To: Military Radio Collectors Association <[email protected]>
Subject: [MRCA] Key Ident

Was going through my keys and found this. Anyone recognize this key. Is it military ? Does it mount on a small transmitter or miniature telegraph console?  Very well made. Several adjustment screws and has a "shorting" switch and  two long mounting bolts.
Z