This arrived in the mail today: Très ancienne pierre à affûter pour rasoir boîte bois en vente sur eBay.fr (fin le 28-févr.-10 19:22:28 Paris)

I just lapped it and gave my Goldedge a touch-up with it. I'll post some more pix tomorrow.

Added advantage is that I now know that a nameless I have had for ages appears to be a brown Thuringian as well!
I'll post pics of the lapped hone tomorrow.