H-factory 111M bezel construction

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I have acquired one each of the H-factory 111M and 177M, getting ready to do the usual parts transplant into my 111J, upon close inspection I could see the new 111 & 177 both have the pry notch on the bezel @ 11, when I looked from underneath (movement removed) I could see a black rubber o-ring like thing in between the mid case and the bezel. Has anybody here actually removed the bezel and crystal to do the similar? Are these new M serial from H-factory changed over to gen constructed cases?

BTW, my new twins both have the engraved SWISS MADE on the inner case back, just like the Noob factory 111J but a better finish. What disappointed me is the H-case backs are mineral glass while the 111J is tested sapphire crystal with my diamond tester.