Flag of the Yacht Club of the Soviet Navy / флаг яхт-клубов Военно-морского флота, Союз Советских Социалистических Республик. Image based on design as depicted here: http://ogeraldike.ru/books/item/f00/s00/z0000007/pic/000043.jpg. This version is different than Victor Lomantsov's found here: https://www.crwflags.com/fotw/flags/su@yc.html. But, Soviet voluntary sports societies frequently changed designs as seen on Lomantsov's site here: https://web.archive.org/web/20210130224809/http://www.vexillographia.ru/russia/USSRspor.htm. Anchor design adapted from - https://en.wikipedia.org/wiki/List_of_Soviet_navy_flags#/media/File:USSR,_Flag_commander_1932_inspector.svg
Own work
Shorepine