Standard Magnetics - SHD1 - 1979 - US
Can't find anything at all on these, not even another picture on the internet.
These don't look home made. The shell proudly boasts "Made In Canada". Dating them, I'd say these are from the late 70s.
Hate to say it, but these are rare beyond rare.
However, in that SCREWED shell, there lies a tape that looks, biases, levels and records really well. Type 0 these aren't, in fact the blue leader says AGFA...but I can't prove this, as these aren't in an AGFA shell.
And the old school black / clear case is nice too.