CoCl2 has been intercalated in a stage-3 CrCl3-GIC to give a pseudo stage-1 GBIC with intercalate stacking sequence -A-B-B-A-, where A = CrCl3 and B = CoCl2. The magnetic properties have been studied by SQUID magnetometry and a.c. susceptibility experiments, and the magnetic structure investigated by neutron diffraction. The data provide evidence for an antiferromagnetic order along the C-axis below 11 K and a helical magnetic phase between 11 and 15 K.