I got this hone in ebay from AJ who seems to sell a lot. It did not come in a box but the slurry is purple and AJ says that is a 12 K.
I ll just use the YL for refreshing.
Thanks for all the replays.
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Being a hard natural stone and a bit slower you will want to do more lsps for refreshing than a more aggressive synthetic stone. As for factory edges if it isn't truly shave ready like some smaller maker's but so so like Dovos etc seems to be then you want to start by setting the bevel and working from there. Should be a fine touch up or barbers hone style use stone though
I just tried honing my Boker Silver Steel.
I did 20 laps then Chromium Oxide and finished with a good strop.
Lets see how it goes tomorrow morning....