Hi David,
Thank you so much for pointing out this bad trend of faking plug bayonets, it just had to be said!
Over the years, I have noticed remarkably many dubious - to say the least - samples of that group coming into the market, both the later, and more decorative kind used for hunting, and the earlier, plain 'military' late 17th c. types. Not only are they found in internet sales but also in established auction houses.
So we are well advised to keep our eyes open and at the same time train them on the 'real' stuff.
Best,
Michael