Hm, hard to tell in it's present condition. I would suggest to remove its rust and then lets check what you've found there. Here is some information on how to remove the rust:
V. Iron - Steel
Rusts more readily when taken out of the water due to the exposure to Oxygen in the air.
* 1. To prevent disintegration, soak in 5% Sodium Hydroxide (caustic soda or lye). This can be found in the drain cleaner section of your supermarket. Fairly new items should be soaked for about two months, real antique s take about a year of soaking. A sturdy plastic containor with a tight lid is best. Of course, the size of the object may be limiting.
* 2. Iron and steel items can be galvanized in the following manner: (WEAR GOGGLES, GLOVES AND BE CAREFUL!)
o A. Buy chunks of zinc, perhaps at a scrap yard or recycling center.
o B. Hold them over the lye bath containing your artifacts, and melt them with a torch. As they hit the surfac of the bath they will splatter.
o C. When the bath has cooled, wearing rubber gloves to protect your skin, pack the zinc around the object so that it is completely covered. Leave for a couple of months, making sure that the object stays submerged.
o D. Remove and let dry.
o E. If desired, paint acrylic or rust-proofing spray paint.
* 3. Large things, such as anchors, can be sand blasted and painted to preserve.
Best wishes,
Christian
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