There was a Golf course near where I grew up, that dated to the early or mid 1950s. And when it finally got shut down and turned into something else (about 15 yrs. ago), we found lots of coins during the turf scrapes behind the tractors. Simply amazed me, because since grass is kept mowed *sseeeooo* nice and flat (for purposes of golfing), you'd think that coins simply couldn't get lost and covered. But somehow, they were there.
And this course had been a polo field in the 1920s to 40's, prior to being a golf course. So we were also getting coins from that era too. But got many that we knew, date-wise, were coming from the golf era.
One caution is: Some golf courses do a lot of "sculpting" of the landscape. Ie.: make slopes, grades, traps, etc.... I talked to a greens manager at one of the high end older Pebble Beach golf courses, who told me that the ground had been moved around so much over the decades, that they one time found a 1920's golf club 5 ft. down during new renovations (had been buried down in past remodelings).
So hopefully yours is the type that's always stayed flat.
