Hand-built C14 Laves (MgZn2-type) crystallographic input for lambda-WFe2, the measured phase of REF-03/REF-04 in the Fe-W magnetization reference panel (dataset 01a07d46). Ideal Wyckoff coordinates (W 4f z=1/16, Fe 2a, Fe 6h x=5/6) with experimental lattice parameters a=4.7240 A, c=7.7027 A. Validated: parses, Fe2W, 12 atoms, P6_3/mmc #194 at symprec 0.01 and 0.1, density 13.186 g/cm3 (matches Z=4 expectation and the 13.1 g/cm3 implied by Koten et al.), min pair distance 2.36 A, fully ordered. GGen (route 454b4729) relaxes WFe2 to a CdI2-type P-3m1 polytype (actions 01a07d78-5c45, 01a07d79-9135) and could not produce this phase.