Mid-Century Italian Ceramic hors d' ouerves set in basket marked "made in Italy 378"

I posted this here some time ago, with the hope that SOMEBODY out there would know anything about it, but to no avail. I thought I might try again with a new audience. The stick figures remind me of something I have seen, but I just cannot recall what it is; The colors in the skirt and blous of each figure is slightly raised, as though a second coat was applied on top of the first. Everything else is visible in the photos. I wonder if the number 378 is of anyh significance?
I sure would appreciate any input you might have.
Thanks....