I wish it was a holley 5210 worked on a few of those also my Weber has no markings on it other than one spot and it just says Weber the adaptor plate I don't think it said anything when I had the carb off for a deep clean but I did notice any adjustments made to it the carb was very sensitive to it it very well might be a guinuine or a good knock off next time I take it off I will double down on verifying it.