This important Dutch bottle is rare in many ways, from the deep amethyst color to the applied smooth mellon like ribs to the diamond point engraving attributed to Willem Mooleyser. For similar work see Antique Glass Bottles by Willy Van den Bossche on page 115. For other examples of Mooleyser engraving see Glass in the Rijksmuseum Volume II pages 77 and 84. A top Dutch bottle. Missing stopper. For a similar type of engraved bottle but with the more commonly seen molded ribs, see this one that sold at Lemperts in 2020 for 36000 euros plus 36.94 percent buyers premium here - https://www.invaluable.com/auction-lot/a-blue-glass-bottle-with-ribbed-decor-801-c-7d648df96e?objectID=155963490&algIndex=archive_lotNumber_asc_prod&queryID=217ab8402ea10917a6d3e41797222253