Yep, agree with Marc except No 3 which is Australian, cotton woven, introduced in 1949 for khaki drill and abolished in 1952 when such distinctions were no longer authorised. Note it was manufactured in left and right versions because rank was worn on both arms from 31 August 1949, and it was part of the badge of rank and appointment of Master Gunners only, as the badge for senior NCO of the Royal Australian Artillery had been abolished during the Second World War (even though it was still worn in metal unofficially in some regiments as the distinction of a Gun No 1 until as late as 1965).
You'll find the bottom gun is also Australian in manufacture, and probably dates from after 1933 when gold embroidered badges were approved again for the Permanent Forces only in full dress. Loads of them came onto the market late in the 20th Century as the Australian War Memorial off-loaded stuff that had been dumped on them post-WW2.
Keith
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