The Seattle Mariners came into existence as a Major League Baseball franchise in 1977, so they've been around for a while. And yet, they're just three years older than the Silver Slugger Awards, which were first introduced in 1980.
The Silver Sluggers are meant to honor the "best" hitters at each position in the American League and National League each year, though there is a subjective element to how the winners are chosen. The manager and three coaches from all 30 teams get a vote, with their votes ostensibly based on statistics and general impressions.
It's not surprising that the Mariners have had their share of Silver Slugger snubs over the years, but they've also had seven different players win the award — and all seven have done so multiple times.