Yes,

Without my dive log in front of me, the I cannot recall the site.
I will look in my log book and follow-up, if someone doesn't beat me to it.

There are two of them, relatively close to each other.
One is leaning against the coral, the other is still 1/2 burried in the sand.
I would put them at maybe 18+ feet long. They appear like the anchor you
would find on Popeyes arm.. Long and slender.. Not like what we would make
today.

The dive site is a great dive and the anchors are seen near the end of the dive.
One of my favorites out of the many favorites I have in Cozumel.

Cheers,