https://www.hope-education.co.uk/product/curricular/mathematics/measurement/20p-coin-set---pack-100/he1706979?pk_cid=1&pk_keyword=HE1706979&pk_medium=multifeeds&pk_campaign=Google&pk_source=Google&pk_content=BusinessIndustrial&msclkid=8a6e9c40b28a1ce40d1aff23591e8800&utm_source=bing&utm_medium=cpc&utm_campaign=[SHP] [Products] Curricular [3]&utm_term=4587231238347420&utm_content=Catch All
I think the blue one shown above is the paperback version, which is also readily available on Amazon.
I too have the hardback, bought in 2009, and not for sale
I vaguely remember plastic facsimile coins when I was young. Forget how realistic they were and they went in the plastic cash till our grandparents had. Ting! Draw shoots open!
I have listed this because it obviously is not a Mule and yet the NGC seem to have mislabelled it as beaded one side toothed the other ...sorry about any confusion it is listed on ebay