Studio Dynamics - SHD1 - US
Made in or prepared for Canada. Toronto, Ontario.
By Standard Magnetics. Described as a Super Ferric High Density Ferric Oxide.
Note: These tapes were bought brand new and very likely intended for a music production studio and/or for commercial purposes.
Best guess, these were made circa 1979.
No trace, no picture, no articles of any kind on the internet about this tape. It may be therefore exceptionally rare. Not particularly a very aesthetically attractive cassette, but a rather clean, sharp design and very well kept for 40+ years. Tape is smooth, shinny and darkish brown.