If the original 531 decal had red and green and black writing then it is 531SL and it is rarer than either hen's teeth or rocking horse manure and is worth a bit more than £60....my 2 cents!
@marxist_vulcan started
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If the original 531 decal had red and green and black writing then it is 531SL and it is rarer than either hen's teeth or rocking horse manure and is worth a bit more than £60....my 2 cents!