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If you are, here goes. I tried to get the provenance. Not much luck. This comes to me from a friend, who got it (and too many other, he feels now) from yeeBay sometime ago from a seller who did not know much about it at all.
(To all others, before you start, I do not want any of your knowledge about the caliper either.)
Yes, I am serious.
The blue part caries the white lines of a La Veinette, but those are always very uniform, and I've never seen a La Veinnette with such an undulating separation line.
La Grosse Blanche of course does exist as a natural combination version, but I've not yet seen one. I know from Maurice La Grosse Blanche does not exist at the depth they're currently mining, so unless they start mining back at higher levels farther to the East, I don't expect to see many Grosse Blanches. (The same thing is true for La Grosse Jaune)
Paul is right that the spots do look like those found on some La Grosse Blanches, but they usually have a brown hue.
It almost looks as it the slurry stone is trimmed off the main stone.