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Ask him how old should it be, 500 million years or 500 million and 50 years, must make for a huge difference having in mind that the geological formation of those rock has ended millions of years a...

Not only for sword polishing, stones suitable for woodworking tools can go up there as well.

It must be because it was bought 50 years ago, the earlier it was dug out the better it must be right?

Ardenes sell 250mm x60mm for about 360 usd, that extra 2" on the listing is worth ~2 more 250x60 coticules.

Good luck to the seller, lol