I've got a Seiko auto case no. 6119 - 8190 to overhaul and fit a new glass to.
I can't get the case apart.
I've tried using my Favourite glass/back press but maybe I'm doing some thing wrong.
Photos to come
Forgot to mention... once you get the crystal off, you will see a little metal tab in the gap between the dial and the case around the stem area, this is the stem release. You may need to pull the stem out.