Mystery. What happened to my vintage Rolex?

[ZzLaws]

I purchased my Rolex in Switzerland in the early 1980’s.

It has operated flawlessly all these years …except late 80’s I dropped it on a tile floor and cracked the glass bezel. It was sent to a Rolex repair facility in New York and as I said- worked without issue all these years. I put it in the bank safety deposit box 2 years ago. When I retrieved it recently- I was stunned to notice it was not working. Upon closer inspection I see what appears to be tiny dark pieces (almost like tiny rocks) that roll around the face…also- it appears there is some sort of degradation on the hands and face as well. What on earth is happening here? Does anyone have an idea?

Regarding possible repair- I phoned an authorized Rolex dealer/repair facility. They indicate do to the age…they do not offer in house repair…it must be sent to Rolex etc… repair estimate 800-$1300! After I picked myself up off the floor…I found this forum. Hoping someone here has experience in this sort of situation and might guide me towards a reasonable solution.

Thank you!

(Trying to upload a photo but it’s too large so will try again…)