This calibration set is old and is missing some pieces (weights). I am not sure of the age, as the wooden box and weights have no markings. The box itself slides apart as shown in the photos.
up for auction is a complete set of CJ Johansson split ball bore gage model 1-L .355-.835 range .0001 resolution this set set is used, in perfect working condition, nice and clean, no engrave, the only problem is the wooden case is falling apart, glue dried out, need to re glue them back any question please feel free to ask
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