I think it's the LDB3 – 1987-001 3EL+ http://cuds-on-coins.com/ldb3-1987/ DIE MARKERS: OBVERSE – None Noted. REVERSE – Die Cracks Top Left & Bottom Left of the Memorial
Unless it can be proven that the obverse/reverse die pair is the only one known, then die cracks on the reverse would not be a very good marker. Chris