I stumbled across this fortuitously since the fenceline to the wonderful Afon Y Dolau Gwynion chambered cairn bisects the monument. Not a great deal left, but bonus sites are always welcome. Great position, too.
No doubt as to ‘authenticity’ since, according to our friends at Coflein, the site is:
‘A much ruined round cairn, 9.0-11.5m in diameter, a cist was observed and an urn recovered, c.1830.(source Os495card; SJ02SW9)
J.Wiles 25.09.02’.