Firstly ......dial /caseback look okay to my eye ....with the obvious exception of the lack of the T HYPHEN T under the six ....but ......I have seen a few Pre-A's where the the white painted writing of the T HYPHEN T has literally started to de-bond and fall off and you could see bits of white paint floating around in the dial .......remember this was relatively early days for OP and mistakes happened .
Rather than let OP change the dial for ,say , an Luminova dial .....a collector MAY have asked a watchmaker to remove all the faulty White painted letters so it didn't cause any potential damage to the watch dial /mvt and looked overall much neater .
The more cynical amongst us might also suggest that the writing under the six has been removed to try and pass the watch off as the arguably more covetable Pre -V two zero three A ?
All the above is just my humble opinion having gone through the murky tunnel of collecting Pre A's and V's about ten -fifteen years ago
I hope you get to the bottom of it to give you some peace of mind