Bomb Station Distributor Selector SD-1 for TBM Avenger C-45 The scale is interesting in

The scale is interesting in that the long pointer rotates clockwise from the 6 o'clock position indicating altitude in 100 Meters per index tick mark along the outer scale

The purpose of the two small upright brackets located at East and West is unknown

a winder and duration-selector is visible at the bottom of the recording drum

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The master unit holds the magnetic element

Bomb Station Distributor Selector SD-1 for TBM Avenger C-45 The scale is interesting inThis is an authentic WWII era Bomb Station Distributor Selector SD 1 as used in the US Navy's TBM Avenger multi purpose carrier based bomber. The Distributor Selector was located in the TBM's bombardier's compartment behind the flight deck. See photo and page from the TBM manual showing its location. According to the TBM Avenger Flight Manual date Nov 1944, the TBM could carry bombs in the following configurations: 12 100 lb bombs, 4 500 lb bombs, 1