Would 15200 (1996) be 904L or 316L?

[BigPapiDoesItAgain]

I've seen conflicting things...Rolex own website says: "In 1985, Rolex became the first watchmaking brand to use this steel from the 904L family for its cases.". But doesn't specify if it that is for all SS cases from then on, or just some models.

I read this in a review on the Beckertime site: "The ref. 15200 is a purely stainless steel watch—the 316L grade Rolex used up until the new millennium before progressing to the insanely tough 904L of all its contemporary pieces.". I have an "L" serial number 16610 that I bought in 1989 that I always thought was 904L and feel like I remember the SA crowing about that fact.

I'm wondering if it was some cases in the line or all. I have a blue dial example of the 15200 in transit to me. Doesn't matter except that I want to deep dive on everything I have in the collection.

Thanks for any help on this.