As for the Delrin vs metal brake, it seems to be a back and forth thing over the years. For other swatch product like 7750's (omega 1150-60) the hour recorder was originally 10-teeth in delrin, but because of work by owners like Peter Schweitzer (R.I.P.) they remade it to a 2-tooth delrin brake, but other versions like 7753 used a metal brake with essentially 1-tooth.
I would be surprised if they changed it back to delrin, but if its supposed to be the first service it should be unopened and in original configuration, dont you think? I do, and that is how BreitlingUSA did things, and they were terribly lax compared to the giant starship that is Omega and Swatch group. Also consider some workshops would dump a half dozen movements into cleaning baskets and assemble them into watches, only looking for bridges to match. Breitling has a team doing 10 movements per person daily and they dumped 10 movemnets parts into baskets and built them up from whatever was clean and passed parts inspection...again I am just being devils advocate and mentioning the "scary stuff".
Usually if the seal mark on the case is broken they dont service it under a warranty or free service unless they're telling you it goes to Omega UK and it really goes to an independent shop with or without parts access. That would be hard to figure out anyway.
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