Watch List notes:

Education: Scotland, Argyll, Oban High School, prize, 1910, "Best in Gaelic", silver Celtic cross, with gold centre of school badge, a sailing boat, rev. named to "Jessie MacKinnon", Birmingham Hallmark, maker RD & S, 40mm., brooch mounted, very fine, the design typically Scottish Arts and Crafts
The School opened in 1890 as the Oban Higher Grade School, in a building was designed by Alexander Shairn. It seems unfortunate that such an intrinsically Scottish badge should have been made in Birmingham.

Estimate: 70 - 90 GBP