Porcelain Mug, Seasonal Kid's, Hand Painted Over Glaze; Initials: Whodunnit?

Today's find...I haven't even washed it yet. Fairly large; 4¼" high, 3¼" rim diameter, ~4" max diameter; 32.4 grams. Capacity is ½ liter, with a ½" freeboard. The bottom has an impressed underglaze mark, but there's not enough detail or contrast to get a decent pic. The paste is very slightly translucent; it's high-fired, with a bright, clear ring when tapped with a fingernail.

I think the mug is European but the art is, I strongly believe, American (or Canadian?). Those kids look so very familiar...but I cannot place them, even with the help of the E.C. signature.

When were Dunce-caps in vogue? That poor kid!

With any luck, though...one of you will recognize this li'l treasure.
Thanks for looking!

 

There's a vague similarity to the Campbell's Kids by Grace Drayton. Could be from the same period.

Are the colors fired on? If cold painted, cleaning could be risky. Definitely not dishwasher stuff.

 

Yes, certainly they're fired on...or they'd be long gone by now! And I don't even have a dishwasher...all my stuff is vintage or old, so hand washing is the norm here.
I'll follow up on Grace Drayton, Thanks!

 

So cute!

 

OH My, they're ADORABLE, and Oh So Familiar.....BUT just NOT popping into this cranium either!!!! Maybe if I sleep on it.....but I wouldn't count on it!!! Maybe 1940's or 50's????

 

I'm more like teens thru 30's...based on several small, weird details. ICBW though...it's becoming habitual!

Grace Drayton's lovely work is way too tidy, too well executed to serve as a model for this...IMHO.

 

SO, maybe I'm not searching back far enough!!! Will try a little deeper!!