Odd Double Step Speedmaster Caseback 1x5012-68 SP

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I was recently perusing some auction listings and came across a "junk" lot containing an Omega case and caseback. The caseback caught my eye - it appears to be from a Speedmaster but has some contradictory features. Has anyone seen a double-step service caseback before? I bought it out of curiosity and it's currently being shipped to me.

Here are some of the listing photos: