The first two don't look like brass to me, more like coated steel, hence the rust. The first one has a coronet in the design, not a crown, the lion surmounts the coronet and is not astride it. The second one has a crown surmounted by a lion, not a lion astride a crown and the whole thing looks like a piece of old costume tat to my eyes. The third one looks to be Australian Militia and appears to have spent a long time in unfavourable storage conditions. In militaria circles these things are usually referred to as waistbelt clasps.
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