This collie is the purple with light overlay known as “Royal Lustre”, Similar to the purple swirl Mossers but the latter is … well … “swirlier.” Case in point, this purple swirl kitten salt.
It is completely opaque, and I love the way the darker color highlights the detail on the ruff and body “fur.” It lacks the second “M” on the bottom, so it was made sometime after 1980.