Stores Reference 6B/125. By W. G. Pye & Co. Ltd. Metal construction with sliding scale for airspeed and scales to allow for drift and distance etc. Shows light use and wear but is in excellent overall condition. 1940 date code. In the original felt lined wooden transit case. This shows light wear and use with some moth damage to the felt lining. Twin clasp closure and single leather carrying handle. Stencilled with manufacturer's markings and reference details to one end. Used by Navigators to calculate their routes. A really good example. Stock code M23241.