Sonachan Hotel is reached.
this page on Birmingham button-maker Hammond Turner & Sons' website. Scroll down to Image 7 where there's a picture of identical buttons - but they're not sure whether they are from the Royal Northern Yacht Club or the Royal Naval Yacht Club. The presence of thistles on either side of the button suggests it's the Royal Northern. A search for this reveals this entry on Wikipedia, "The Royal Northern & Clyde Yacht Club was founded in 1978, by the merger of the Royal Northern Yacht Club (founded in 1824) and the Royal Clyde Yacht Club (founded in 1856)."