[Richard Coutts-Smith]

Yep, should have considered size, weight and thought a bit more before I made an off the hip ID. but 113 does surprise me.
I guess Bandiana Army Base (they have a lot of 113 work done there) is 90 minutes away, may have been the source of supply and machining. Unless there was a cross border raid and they were borrowed off the Wagga display FOV. One side is Deep Bronze Green, the other over painted with Olive Drab ?, that ultra flat stuff anyway.
Late 70's on I would say, the original tow (about 1952) was a truck on blocks with the diff locked and a rope over the bare wheel. It ran continuously, which apparently took some skill to hook on to,the latter incarnation could be controlled from out on the slope, and was much more forgiving.
Rich.