Hi Tony, I think the fat arrow MoD reprinted dial is a very inconsistent printing, quality wise, and one of my least favourite personally, and I like an MoD reprint. There are also (I suspect) some later refinishes too that are actually technically better, but aren't MoD.
I have seen the case backs both smooth/polished and seemingly with turning marks, for some unknown reason, but I think both are most likely 'good'.
I think the crown could be a WWW crown which is very similar but slightly thicker.
If the watch has the anti mag movement cover and the doohickey spring thingie my feeling is it is an honest watch. But never say never.