1. W & G made slide rules in Australia from about the start of WWII through to the 1960's and possibly early 1970's.
2. This model rule was made for use as an aid for Surveying and Artillery.
3. This particular rule appears to have been originally issued by the Australian Army in 1952 but like most modern forces that body has long gone over to using more modern calculators and computers for these tasks.
4. I have included a scan of part of the edge of this rule, it shows the lovely grain on the wood used by W & G for these rules and I have been told that they used either Australian Silver ash or Quondong wood.

Brand	W & G - White and Gillespie
Model	Model 454 - Dualface Artillery and Survey
Country of Manufacture	Australia
Date of Manufacture	after WWII
Scales Front	L, A [B, Reciprocal(CI), C] D, Cu(K)
Scales Back	Sine(1), Sine(2) [Angle 2, Angle 1] Range, Tan(1), Tan(2)
Number of Scales	14
Slide Rule Materials	Wood/Celluloid
Cursor Materials	Metal/Glass
Cursor Lines	1 Front, 1 Back
Scale Length	25.5 cm
Length	34.9 cm
Width	4.3 cm
Condition	Good, missing one screw on the Cursor
Documentation	None
Accessories	Heavy cardboard slip case