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Flag or crest https://imgur.com/gallery/dUVF7pt
On a lamp post on the way home from town, Doncaster.
Google lens tells me it's a clothing brand called 1887...
https://www.crwflags.com/fotw/flags/de@hsv.html
Description of flag: It is a blue flag divided by a black centred cross fimbriated white. In the quarters are numbers as follows: "1"(upperhoist), "8"(upper fly and lower hoist" and finally "7"(lower fly). Together the numbers are forming "1887", the year in which HSVwas established.Having made further inquiries about the subject, here are our results: The 1887-flag is definitely a supporter's flag, sold exclusively by a shop dealing with "football fashion for Hamburg" and has nothing to do with HSV. Christian and I visited the HSV city fan shop to get this information. The reason for the existence of the 1887-flag is very simple. Hamburger SV has changed the HSV-rhomb(German: Raute) into a registered trade mark and takes ridiculous licence fees for any product containing the rhomb. First we have to alterate our description of the official club's flag. It is not diamond in diamond in diamond but a black rhomb in a white diamond. Second Hamburger SV nevertheless is very popular and has fans spread out at least all over Germany, among those a lot of people, who can't effort the ridiculous prices. So the simply use cheaper products free from licence fees. One of those is the 1887-cross-flag. Klaus-Michael Schneider and Christian B. Schneider, 8 Oct 2009
Cool. Wonder why it's ended up on the lamp post over here. Plenty of east Europeans in the area but I wouldn't have thought many from northern Germany. Every day's a school day. Thanks all.