We have stabilized a new ytterbium-based ternary derivative of the CoSn-type (P6/mmm) FeSn compound whose chemical composition is Yb ~ 0 . 6 Fe 6 Sn 6 . The crystal structure of this compound can be viewed as a lacunary isotype of the SmMn 6 Sn 6 type of structure (P6/mmm), a partly disordered variant of the HfFe 6 Ge 6 -type. Powder neutron diffraction experiments indicate that Yb ~ 0 . 6 Fe 6 Sn 6 adopts an antiferromagnetic arrangement (+-+-) built upon ferromagnetic (001) Fe planes, with the iron moments in the basal plane (μ F e =1.87(2)μ B at 2K). No magnetic ordering of the ytterbium sublattice is detected down to 2K. These findings are corroborated by 5 7 Fe and 1 1 9 Sn Mossbauer spectroscopy experiments. The local orthorombic symmetry of the iron site allows observing anisotropic contributions to the total iron hyperfine field. As a consequence of the ytterbium under-stoichiometry, the magnitude of the transferred hyperfine field on Sn(2e) nuclei is found to be slightly distributed with a mean value of <H>=12.5T. The results are related and discussed to previously published data concerning other R 1 - δ Fe 6 Sn 6 representatives as well as the binary FeSn parent compound.