This is a HO model of an English K. & E.S.R. Tenterden Town narrow gauge 3 arm signal that I was asked to do if it was possible. It is not a an exact replica as the original has a lattice post and McKenzie and Holland style arms and finial but the modeller who requested it is happy with this tapered wooden post version.
Of interest is the middle signal arm on the post which faces to the rear of the signal.
A set of the NSWGR 4 Arm Detail Parts are required to complete this signal.
https://www.shapeways.com/product/UHURXSEH5/4-x-39-quot-arms-signal-parts-ho-nswgr-lq?optionId=42866121
Also needed are several small bolts, a washer and some 0.015" phoshor bronze wire or equivalent.