LBN 603 is a very faint nebula (brightness index 6 which means dimmest) in the constellation Cassiopeia. Also in the field are some dark nebulae from B. Lynd's dark nebula catalog (LDN 1295, 1296) and from the Tokyo Gakugei University catalog (TGU). Unfortunately, little is known about this region. In any case, these objects are rarely photographed.