My daughter found a stone that is puzzleing us, on Hill Head Beach In Hampshire.I has a serial number stapmed on one side. 299537The Serial Number looks to be made from a stamp similar to a date stamp and is prominently embossed on the rear. It must have been made before the material had hardened.The Material is very hard, scraping it with a screwdriver leaves no mark apart from a silver mark from the metal. What Is Puzzeling us is this looks like a normal un-interesting stone, like all the others on the beach.
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GeologyRocks