Solve my mystery ... Depression Era Tea Cup

I am trying to find out what pattern is on this tea cup and any other information you may know of.

My mom had 12 of these tucked away in the bottom of her China hutch and said they were her mom's. She liked the pattern but couldn't remember what it was called. I told her I would google it, but am having no luck.

Help me solve my mom's mystery!

Tea Cup 2-3/4" tall x 2-1/4" top diameter
Saucer 4-1/2" diameter