rehaut engraving started with the D series.. so all M, V, (G and randoms) most recent- will have it along with some or many Z serial and i have heard even the possible D serial which preceded the Z. not all D and Z were done.. i have no idea why.
As for any difference the pre 1998 serial U , T etc going backwards will have Tritium hour markers and hands rather than Luminova which was introduced around 98 so A serail forward will say Swiss made on dial and pre A wil say swiss T<25 ( tritium as luminous paint) of course there will be the odd crossover.
it is only the 116610 that has the ceramic bezel.
hope that is of some help
Cheers
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