Arm identification

Hi all - first time poster, long time lurker. I got a new (well, 1983) deck which has an arm with no name. The only markings I can spot are a 5 on the rear behind but not on the counterweight. Can anyone tell me what it is please, and maybe even a bit about it?

Thanks in advance.

An externally hosted image should be here but it was not working when we last tested it.
 
It looks Japanese, but don't recognize it. Vaguely resembles a Grace arm,
but Grace made many models that I haven't seen.

That is on an LP-12? I don't think it is an arm that was sold by Linn.
You could contact Sumiko, who used to import Grace in the USA.
Home - Sumiko Audio
 
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