Drie muzikanten Grote paren dansende bruiloftsgasten (serietitel), RP-P-OB-2797, Heinrich Aldegrever, 1538

The three instruments have been identified in the dutch caption as sackbuts. That instrument, like the trombone, requires that the tubing slide in two places (which it seems to for the two instruments closer to the viewer. ) the top instrument may be a slide trumpet; if it slides at the enlarged tubing just below the mouthpiece, then it is only sliding in one place, like the slide trumpet. Date: 1538.