Is this anything special, a blue dial 3510.50 with flat caseback and Omega engraving

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This watch puzzled me as I haven't seen anything similar, caseback is weird, the dial appears as blue

 
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The dial is actually black. A small number of Omega hesalite crystals from this period (late 90s) opalesce and make the dial appear cloudy blue.
 
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With that unadorned caseback I’d suggest this Reduced is from more like '88-'92, the very first had that plain back. As noted above, It’s just the light making the dial look blue. Note if it was a factory blue dial the PIC code would be xxxx.80
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It’s this all over again…

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