These are miniature versions of the full-sized medals. I have heard they were made for
diplomats, but this doesn't seem to be true. Actually, if one was awarded the medal, one
had an option to order the miniature at an extra charge.
These are all officially-made miniatures. You can see some privately-made medals here
and there, but the quality is low and they are usually for the orders, not the commemorative
medals. Here are some excellently made Manchukuo medal miniatures.
Another example, with some obvious differences