I don’t know if I had ever heard this before. Time for someone older than me to be upset that this dumb Gen Xer has never heard of this…
On March 28, 1976, a report circulated from the Newark Star Ledger that Tom Seaver had been traded to the Dodgers in exchange for another Hall-of-Famer in waiting, Don Sutton. The report indicated the trade only needed Sutton’s approval before it was completed. Since Sutton had one extra year of service on Seaver, he met the ten-year threshold that gave him the right to refuse any trade.
Source: Tom Seaver Trade: That time he was almost dealt to the Dodgers