Does it have a ridge in the bottom?

Not sure what you mean by ridge. There a 3 raised bumps to elevate soap disc. Otherwise the sidewall to the bottom transition is a smooth, 90 degree angle.

What is the bottom inside dimension of the mug?

The bottom ID is 2-3/8” which flares out to top ID of 3-3/4”. There are also three raised 1/2” long indentations (textured) at the bottom which assist in whipping up a lather. Hope this helps. Very nice mug with a classic handle! Cheers

Brand	Mühle
Model Number	RN 4
Color	White
Product Dimensions	11.8 x 10.3 x 7.4 cm; 201 Grams
Capacity	1 Liters
Material	Porcelain
Special Features	Reusable
Item Weight	201 g

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