Mark 5 - 500 - 1050s model with smaller table but generally same as today
Mark 5 - 510 - Larger table with pipe-shaped fence rails
Mark 5 - 520 - Precision extruded aluminum rails, thick fence with several t-slots
Mark 7 - Modernized 520 with PowerPro Headstock
PowerPro 2 - Updated digital read out and touch screen, same powerpro motor. Can do 120v and 220v