The Australians were not the only ones to use fabricated and welded parts: the Canadian C No.2 and 4 Saddles were manufactured in this way.
The CM-1600 box for tools was labelled a CCM-1600 in Canada - the Canadians seemed to be very keen to add the extra 'C' prefix to anything of Canadian design/manufacture. The smaller parts box was the CM-1599, labelled 'SPR.PTS. 25-PR' on the upper line, and 'PT.NO.CM1599' on the lower line.
By the time of the last disposals of 25-pdrs in the 1970s, 25-pdrs in Australia were a mix and match of parts due to replacements.
Interesting your images taken at Bandiana all show early breech rings with the rounded curve for the sweep of the breech block handle. Australian breech rings, like most Canadian b/rings, have a series of 'flats' to make up the curve for handle clearance, rather than the smooth, continuous curve. The attached image illustrates this - the breech ring is a Mk.2 manufactured by Chubb Australia in 1942. You'll recognise it Tony - it's not too far from you at Tiaro, and is the one we have both taken measurements from.
Mike
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