Signedfront plate: WESTON ELECTRIC / MODEL 566 No 2299 3 / WESTON ELECTRICAL INSTRUMENT CORP. / NEWARK, N.J., U.S.A.
on face of right meter: PAT. 1,579,849 1,597,256 1,661,214 1,714,065 1,714,202 / VOLTS A.C. / WESTON ELECTRICAL INSTRUMENT CORP., NEWARK, N.J., U.S.A. / MODEL 476 No.121169
on face of left meter: D.C. VOLT MILLI-AMMETER / 1000 / OHMS PER VOLT / WESTON ELECTRICAL INSTRUMENT CORP., NEWARK, N.J., U.S.A. / MODEL 301 No. 2282
ProvenanceDavid P. Wheatland, Cruft Lab, Harvard University, before 1942.
Related Workshttps://www.radiomuseum.org/r/weston_566_1.html