This may be one to post on VW. Scribbles varieties are a lot of "Fun" ha. If there are cracks you can try to crack guide, but I don't think I see any. Good luck!
PS: Date, mm, and ear tend to not be very helpful within the 1921-P,D,S series with the new OBV and REV designs, however there are some VAMs where those shots may help. You did well... normally date, mm and ear are key areas for attribution!
























