Mid-Century? Deco? Heron Mantel Clock, Unknown Maker

I found this three-dimensional clock 13 years ago at an antique fair. The clock has never worked, and it has a couple of small blemishes, but it just kind of grabbed me. I paid $20 for it. It's about 14-16 inches tall and finished on both sides. The number 633 is part of the ceramic back, and appears to be deco-style. Other than that, there are no identification marks. I thought it might be a Jema, but can't say for sure.