Many are the result of grandfathering when the Master/Mate of TV endorsements were created based on restrictions to their older licenses. But that was 20 years ago, and I have heard of more recent issues, I am not sure why those might have a tonnage limit. Removing the tonnage limit for the grandfathering based limitation is addressed in “FAQ” no. 13 in Enclosure (1) of NVIC 3-16.
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