Article in the NY Times- 1977 -
Seaver/Koosman/Matlack - I would say these 3 were pretty damn good
The “ship” has been kept afloat for the last 10 summers by pitching in general—by Seaver in particular and then Koosman—and for the last five by the original pair plus Matlack. Last summer, they started 101 of the Mets' 162 games, won 52 games, pitched 46 complete games, struck out 568 batters and delivered three of the 10 best earned‐run averages in the National League—allowing fewer than three runs a game. They formed the heart of the only staff in baseball to strike out more than 1,000 batters (the Yankees: 674).
In return for all that glitter, they also command the three highest salaries on the payroll: $225,000 for Seaver, $150,000 for Matlack, with Koosman in between. But now Seaver, the righthander, is 32 years old. Koosman is 33 and Matlack is 27, and their arms have whipped through more than 6,000 innings. Their problem: lack of support from a team that ranked eighth of 12 in the league in hitting, last in stolen bases and last in making double plays.