Hello i purchased a large international time recording co master clock on ebay a couple of weeks ago perhaps some of you saw it its one of those big ones installed in a school in 1927 to run the slave clocks and the bell system its model number is 13 6 12 it is complete with all of the internal machinery and looks to be in operating . Appraising and dating your clock 165kb model type 58kb time equipment division history 101kb card recorders engineering data sheet 199kb 839kb master clocks colonial master clock data sheet pdf 318kb grandfather master clock data sheet pdf 318kb international master clock data sheet pdf 318kb master clocks . Ibm itr master clock discussion in electric horology started by datamath may 7 2003 international time recording company and later on ibm and then simplex made these clock for a very long time your ibm model 25 master clock once used in your tv station has been modified either during late manufacture or in the field
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