Original WWII Soviet Tanker Helmet

Original WWII Russian canvas tanker helmet.  Original war-time helmet, not a post-war example.  There are no markings.  It seems to be a larger size (I would guess it to be a size 3, but it is hard to be sure without any markings).   It is only slightly worn and dirty with no serious damage or flaws.  It seems to be made slightly different than the other examples I have seen.