The devitrification can be seen here in the pitting and lifting of the actual glass. While minor surface flaking shows patches of a beautiful iridescence, all the result of long-term immersion in the sand, mud of sea water.The base had a picked up to prevent scratches from a broken pontil. This bottle was found by scuba divers, Ray and his son John Demers in the Piscataqua River along the coast of. New Hampshire sometime in the early1960's. Began many years of research. The bottle is 1/2 full of sand mud. According to Roger Dumbrell in "Understanding Antique Wine Bottles" his General Guide to Dating is this bottle is a late onion bottle c.