Seems to me this might be it going by the fact silver sweeps seem to be rare and this is the only one of two that cousins have.
https://www.cousinsuk.com/search-results?searchtext=066TZ1339
Comparing it to the picture in ofri the dimensions look identical.
I wish I could be sure this is for cal 351 and is 10mm.
Any chance you can figure that out Archer?
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