Jean_LAMESCH_Sliderules_Collection_BOX_JL10

1751_OTIS_KING_Type_K

1751_OTIS_KING_Type_K

OTIS KING Model K calculator. British toroidal cylindrical sliderule where the middle sliding black sleeve is the cursor. Sold until 1972. The serial of this item is T7668, so it is prior to 1962. Manual and more here. Original cardboard case.