Thx for clarifying what you have there @mac. What a fun piece of exonumia!
It could very well be an off metal strike by this private mint. I didn't check to see if they are still around (or if someone bought them who might be able to shed some light on earlier times). It certainly looks like silver, but hard to say for sure. As you said, it seems like Metal Import Limited struck mostly in gold.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz