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Thanks for the input. I agree with the desk knife term. This one has been "sharpened" with a rounded, [would oblique be the right term?] bevel. To scrape away a thin layer it would have to be sharp ....

This thread has convinced me I just "needed" an eraser!

I got the one that I mentioned earlier at a local shop.

The other side from the picture is.

J. RODJERS
&SONS
6NORTHFOLKST
SHEFFIELD

Thank you for this post. I have now learned something today! I saw one of these in a shop last week and they said it was for blood letting. It didn't make sense but now I know what it was.