I here you, Jackster. All mine are genuine Matarelli's. I have several of the regular and long reach versions, just in case one walks away.
The patent on them expired.
For the curious, here's the original patent:
Patent US3866959 - WHIP FINISHING TOOL - Google Patents
Here is modified version with a new patent for adding a useless loop spring, #23 on the illustration:
And a story:
Whip Finishing: “Whip Me!” | MidCurrent