Musicmaster SD-12 Transcription Tonearm Info?

I have a Musicmaster Model SD-12 Transcription Tonearm. I cannot find any information about this tonearm on the web. Maybe someone knows something about it, I will be thankful for the information.
Here is a link to some photos I took:
It was a Japanese copy of a Gray arm. There were a number of Japanese copies of the Gray offered through retailers like Allied and Lafayette during the '50's, and it's not clear (to me, anyway) if they were all made by the same OEM.

I've never heard of your turntable--Hamlin Special-- but it may have been produced for a local chain. Pretty piece, reminiscent of a Lafayette model.
I had the Gray version and it played on the 'heavy' side. Be careful of the wear it may do to your records.
Hi Billleebens, thanks for the information.
Hamlin Special was a company in Seattle, that sold audio equipment in the late 50's and early 60's. This turntable is exactly like the Suzuki Denki Musicmaster Point One Five, except mine is 4 Speed, 16, 33, 45, 78 RPM.
Hello Buconero117, thank you for the information. Can you please give me a link of the Gray tonearm you had?
Romyald, are you still active. I would very much like to discuss the Hamlin's MusicMaster TT.