Question about Gold Sub ref 16808

[Subexplorer]

Hello friends.

Just a question to owners (or fans) of gold Subs.

I was offered a c.1988 reference 16808 full gold Sub with matching Oyster bracelet. Blue dial & matching blue bezel.

Watch is completely original, and dial very similar to my TT 16613 Submariner blue dial... except, this full gold has a subtle violet hue on the blue, which is viewed when light reaches the dial in certain angles.

I have seen some vintage Subs in which their blue dials have changed to violet, so this is not strange thing.

My question is: seller told me an strange story, assuring me that these dials were painted in a short period by Porche at the request of Rolex!
Also that reference 16808 was made during a short period of time.

These concepts will not influence the purchase or not of this watch, as the watch is original, in good shape, and a very nice piece, it´s only matter of getting (or not) a satisfactory deal from the seller.

But I would like to know if these asseverations are truth, as I am rather skeptical about the Porche story. Never heard something like that before!
Also would like to know if true that reference 16808 had a short period of production.

Thank you in advance for your kind attention and answers!
Best cordial regards, Abel.