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195923

At first sight it appears to be some sort of Grecian Oilstone (same as LI, but patterned with swathes of darker dots) that has become discoloured.

However, after extensive...

There are good Welsh Oilstones and not so good Welsh Oilstones. The hard ones are from slaty layers that have undergone induration (great pressure) and which have been subjected to great heat - the...

Unfortunately, no.
Regards,
Neil

Yes I saw your post - marvellous catalogue, thanks! I am a bit of a slow typist, so your post wasn't there before I started, and when I uploaded mine, there it was along with several others.

Yes,...

William Marples & Sons worked out of the Hibernia Works Sheffield, the company being founded in 1828 (although his father, also William Marples, was working with William junior in the early 1820s.
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I have a few that are similar, but I do not know for definite what they are:

195819

The one laying vertically on the far left, the one partially under the bottom wooden paddle, and the one on...