I have found this - a report of the actual words used in the letter of the original description of the Kirkcudbright linen smoother with the handle, very like my linen smoother.
I've attached the evidence having photographed it off screen as it's too long to type up.
Proceedings of the Society of Antiquaries of Scotland, One Hundred and First Session, 1880-1881 - on page 192 a report and picture of the linen smoother from Gribdae, By George Hamilton, Kirkcudbright, F. S. A. Scotland. It's dated Proceedings of the Society, April 11, 1881:
https://www.google.co.uk/books/edition/Proceedings_of_the_Society_of_Antiquarie/ll52di4ljB0C?hl=en&gbpv=1&dq=gribdae+linen+smoother&pg=PA372&printsec=frontcover
I also need to correct my comment in Reply #11 where I said the author in the article said they weren't used in Scotland. Further in the article he comments that someone present said the smoother had been in use 'long ago' in their household and went and searched for the smoother and found it, so it was engraved for that article in Fig. 21, 22, 23 (see page 64 of link):
https://journals.socantscot.org/index.php/psas/article/view/5902/5872
I thought I'd look up the lady who mentioned an item (flat bun shaped round one - not the handled item) had been used in her house 'long ago' and sent search out to find the item which was then engraved in the above Proceedings.
It was a Miss Henderson of Stemster of Caithness who had been present when he was showing the item to someone else and it was she who said it had been used in her house 'long ago'.
https://journals.socantscot.org/index.php/psas/article/view/5902/5872I think Miss Henderson might have come from quite a big house with a very long history! - see link.
https://fionamsinclair.co.uk/genealogy/Caithness/Stemster.htmIs this the house?
https://www.stemsterhouse.com/The Proceedings were written in 1879.
She could have been one of the four daughters of Alexander Henderson who also had five sons. She was a Miss.
Of the daughters it's noted : Margaret died in 1879 unmarried, Johanna died 1880 unmarried. There was a Cecilia, and another sister Mary who married.
Then she could also have been a daughter of Alexander's successor David as he had three sons and four daughters and died in 1859. So she could have been quite old in 1879 (daughter of Alexander?) or a bit younger (daughter of David?).
OOOH HANG ON - EDIT forthcoming!On here page 64 it says '
When showing the relics from the Ballinaby graves to Mr J. H. Chalmers of Aberdeen, a Fellow of The Society, Miss Henderson of Stemster in Caithness, who was also present ....'
https://journals.socantscot.org/index.php/psas/article/view/5902/5872The history of the Stemsters says there was a Mary Stemster (daughter of Alexander) married to a Charles Chalmers from Aberdeen.
Mr J. H. Chalmers was Mr Charles Chalmers' son:
https://www.myheritage.com/names/charles_chalmersWhich explains the link as to why a Miss Henderson of Stemster was present at the meeting.
Anyway, if this is the case, I can imagine that item might have been in her house for a long time - 'long ago' is very non-specific in terms of being able to pin down whether she meant 20 years ago, or 200 years ago really. The story of how it was used might have been conveyed to her verbally rather than her actually seeing the item in daily use if you see what I mean?
Although they were discussing the non-handled version my point is that in 1879 none of them knew what it was until she recognised it as from 'long ago'.
And the handled version had sat in the museum since presumably pre 1861 with even at that point no-one knowing what it was.