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@Chris: IMHO the Hohenzollern is on a par with or even slightly finer than my Y/G Escher. To make a rubber for it I cut a Thuringian of the same colour and fineness in half, I have got the other half...

Your new hone seems to have the same colour as the Hohenzollern you sold me some time ago. That one missed a rubber as well. I made a rubber by cutting a piece off a Thuringian of the same colour.
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