I bought a card of four of these about five years ago - same plain backs. Mine are slightly better finished on the front. I have never thought them to be originals; they did not cost much and I have had them as illustrative space fillers.
Perhaps there is an issue that if these were - shall we say - reproduced with a back stamp purporting to be but not from the original manufacturer we get into legal problems. My button collection is at a distance at the moment but I don't recall any plain back Guards-related buttons.
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