I can't view the thumbnails on my device. (video works, not pics)...
Ok, I have an earlier c&o Berk. It is also a Berk JR. like your PEx (vs exacting 1:48 scale versions). They are very similar.
Yours has 4 screws; but don't expect it to fall apart. The fit is likely kinda tight up front at the steam chest AND it takes a near perfectly straight pull up to remove the shell..
Don't let it jam tight if it rocks while lifting, and throw some short spurts of wiggling at it if needed.
I think I got mine apart for the first time by alternating prying slightly 1/32"-1/16", front & rear mostly, rocking a hair as I lifted. (Today it comes out a easier. I also know how to tap the shell and the vibrations get it to drop... You could try that too. You might get lucky.)
And fyi, I don't think you need to worry about keeping this one upright.
The bell & bracket can be replaced. Brasseur's had them if I recall right.(in the advertisers above or ad index.)
(the bell does not look too bad).