Lackadaisy Cat is an award-winning webcomic by Tracy J. Butler. It is set in Prohibition-era 1927 St. Louis, Missouri and features beautifully drawn, anthropomorphic cats. The comic strips are sepia-toned, just like photographs from the 1920s.

Though the webcomic was launched in 2006, I've just discovered it - there are about 50 richly drawn pages for your enjoyment: Link | Here's the first page - Thanks Davis!