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If you bought it from ebay, it's not shave ready.
If you bought it from an antique store, it's not shave ready.

If you bought it from someone from the classifieds and advertised it as shave...

Jimmy's right. If that razor isn't shave ready, the C12k stone won't get you there in this lifetime. It might be best to send that guy off and have someone hone it (if it's not already). The stone...