This is a matched set of left and right 3-on-a-plate tuners with original buttons and gears that work very well. No issues, will keep a guitar in tune, and both have the standard 4 screw holes for attachment to the back...

1948 Gretsch 75 Sunburst Acoustic Guitar. Near mint condition, see pictures! Minor checking, otherwise extremely clean. Made in the United States. Call for details!