how to dismantle the 411 clock?

[Kevin H]

Having dismantled my dash to hopefully help Richard out, I decided I may as well clean up the glass on my clock. Unfortunately it has collected some grime on the inside of the glass!

Does anyone know how these things come apart?

There are two screws on the back which I removed but that just allows the mechanism to move around inside the metal canister, so it seems that I need to take the bezel off to get the glass out. There is no obvious way to do this.

Also, there's the adjuster knob which goes through the glass.

Does anyone have any experience with these things?

Although the clock says Smiths on the front, it says Jaeger on the back.