Until now I wasn’t quite sure if 1213 is the name of a crew, as 1312 could be meant as an acronym for A.C.A.B. The classic meaning is „All cops are bastards“. It often is used as a slogan and written catchphrase in graffiti, but it seems that in Essens graffiti scene exists a crew with the name 1213.
I don’t know anything about 1213 Crew except they are from NRW, probably from the area Essen. I don’t have hard facts due to the members of the crew. All I have, are the names of writers which are quoted due to the pieces I found over the time. And here they are, but, as always, no guarantee of completeness and no warranty of any kind!