Boxford Tumble-reverse gears from Serial No. 11-13513 - the introduction of the Mk.2 Models with a single lever on the top of the headstock to engage the backgears. The tumble gears have 32 teeth and a 20-degree pressure angle. Made in the correct grade of cast iron - we have sold these gears for over 30 years.
For models prior to this with a 14.5-degree pressure angle, see here.