Early 60's Elgin 10K Shockmaster. I suppose one of their attempts at water proofing a watch (see the crystal and gasket in the second picture). The question is how to get the crown off (Its wobbly when pulled out to the set position and I am certain it contains a gasket) so I can remove the movement? Dis-assemble the keyless works in place so I can grab the stem and unscrew the crown?? Thanks.