For me as soon as soon as you say a watch is 19mm thick I say pass. I don't need to hear anything else even if the gen was 19mm I pass. In this case the gen is 15.5 & the rep is 19 are you kidding me. Honestly I can't imagine anyone actually knowing how thick 19mm is and still hitting the "buy" button
All recent Speedmaster co-axial rep are 18.5mm thick. It's not new.
Only way to not have this thickness is to do a clone movement (way too complicated) or remove the decoration (which would be a much worst tell)
I had the recent Speedmaster 57 (41.5mmx18.5) and while tick, it wasn't that bad since most of this thickness was on the domed sapphire underside. Unless your wrist is super skinny, a lot of that will sink in your wrist. and I think a bigger case (44.5 vs 41.5) would balance the watch even better.
Still waiting for better picture/video tough..