Vintage Black School Wall Clock from Lathem, 1980s

This wall clock was produced by Lathem in United states during the 1980s. It features a black metal frame, a metal dial and a convex clear glass cover. The piece has been converted into a battery-powered clockwork and requires only one AA-battery. The weight of the clock is 2 kg.
Measures:
The diameter of the clock is 37 cm.
  This piece has an attribution mark,
I am sure that it is completely authentic and take full responsibility for any authenticity
issues arising from misattribution