after not riding a bmx since 86,i bought this back in 03 from a pal .
had no decals ,so i dont know what diamond back this is,and neither did he.
frame is very light ,alloy tubing ,chunky welds .
has diamond cut out and DB stamped rear drop out, 8 mm,
bottom tubes of rear triangle are square .
20 inch top tube ,
DB aerodynamic forks also diamond cut out .
check the pic of frame no,s (hopes this helps)
it did have alex rims ,binned them for the tuff II,s,
cheers DR VINOAH