How to open Holzkern inner case?

[barnabas]

Hey, I have a Holzkern wooden watch, and it is losing some of the numbers off the dial. I opened the case...but it has an inner case that connects the movement, dial, and crystal. How do I get this thing open?! The blue metal all seems to be one piece...but obviously someone put it together in the first place. I took it to a jeweler who had no clue. Thanks in advance! 

[HectorLooi]

Can't see that clearly because it's all black, but it appears that there is a gap here.

See if a razor blade can be inserted to open up the gap further.

[Kalanag]

Most likely you have to remove the crystal!

A German guy had the same question here:

https://uhrforum.de/threads/holzkern-odin-armbanduhr-zifferblatt-ausbauen.562978/

[barnabas]

Thanks! I never would have found that German article. I don't think a blade can separate the case, the other suggests air pressure. I'll try, and see! Thanks for the fast replies.

[Kalanag]

Air pressure will blast off the case back if it is not a screwed on type.

I would try using a strong double sided sticky tape on the crystal (or even super glue). A new crystal is cheap if it happens to break.