And hope the previous owner/user hasn't burnt all the precision resistance wire in the lower ranges.
Or it's not rotted away on the higher ranges, from being abandoned in a damp shed/loft/garage for 20+years, as in some Muirhead ones I have.
Having said that I have two nice Cropico boxes, that cover the ranges of the dead Genrad box.
Also have a smaller sized general purpose decade box, of lower spec from Cropico.
David