Lionel,
The link you have provided shows the 2/1st Aust Infantry Battalion colour patch, which appears correct for that Battalion. It does state that it is a reproduction.
The 2/1st Aust Pioneer Battalion used a triangular colour patch, grey outer edge (as per 2nd AIF patches), surrounding a white triangle outline with a purple inner solid triangle at its centre.
Hope that clarifies things for you a little.
Mike
Last edited by Mike Cecil; 28-04-15 at 02:13.
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