[89-944NA]

I have a friend who has one in Roland Heights, CA....triple blue same shade of blue as yours.

Here are the color codes for the 1991 944 blues, per Porsche Paint Manual WKD 482620.02, printed August 1991.

LY5D Azurite Blue
LM5A Maritime Blue
LM5N Cobalt Blue Metallic
38B Cobalt Blue
LM5P Dove Blue Metallic
LY5U Glacier Metallic
LM5M Turquoise Metallic
37U Cobalt Blue Metallic
37W Midnight Blue Pearl (waterbase paint)
39C Midnight Blue Pearl

All the non-metallic paints are single stage paint jobs, and the metallics are all 2 stage paint.
If you have the warranty/service manual, you can look in the front, and your options codes are listed there, if not, look in the spare tire well for the option code sticker.

I can only guess that the 2 Cobalt Blue Metalllics (LM5N & 37U) are because of a numbering change during the production year.