Beautiful 6 sided flask from about the 1780s..very dark black glass and in perfect condition. It was around 230 years ago that someone was strolling along the Harbour Rd area  near Cave House...or maybe sitting on the rocks fishing..took the last few swigs and tossed the bottle overboard..and there it remained... 

A few months ago while I was diving in that area I found it wedged in a reef close to shore and was very happy to find it in such good condition..a little plant growth on it..which I scraped off and some coral..which I left on