VINTAGE Boss DD-3 Digital Delay - Blue Label, Long Chip 1986

In the hundred of vintage Boss we've seen this DD-3 is among the most cosmetically warn.  Lots of scratches, chipped paint and heavily discoloured knobs.  But that's okay, we think it looks awesome.  It definitely still sounds awesome.  from 1986 at a guess, the serial sticker is worn away but it has an unnumbered Blue Label and the 'Long Chip'.  No box.  SERIAL: ???