There is only one insert for the 16800.
The flat four insert belongs to the 16610 era starting very late 80s
The correct insert for the 16800 is the semi flat 4 long tail serif insert.
The pearl of that insert would ALWAYS be darker patina than the markers.
This is the same as the SeaDweller 16660 of the same era.
Note that the inserts of the SD 16660 & Sub16800 are not interchangeable.
The font on both inserts are the same and is evidence of the period correctness.
If your 16800 comes with a flat four insert ( i see a handful in this thread), it means that it has been replaced!
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