This is the Holmes Hobbies TorqueMaster Expert 55 Turn 540 Brushed Electric Motor. When you need a quality brushed motor, look no further than the TorqueMaster Expert 540 from Holmes! The Expert series features quality construction and a machine wound armature for an affordable alternative that won't break the bank.
 
Features:

• Machine-Wound Armature
• Standup Brush and 7.5mm Comm- Maximizes power and motor longevity
• Gold plated copper brush hood to resist corrosion and provide lowest resistance
• 4mm web 3 slot armature- Maximizes power and RPMs
• 1.4mm thick can features minimal venting and two high-power FB9 wet magnets to maximize torque and efficiency
• Dual Ball bearings
• Adjustable timing
• 0.55mm Extra Heavy springs for consistent drag brake
• 729 type soft brushes for high torque and long motor life
• Broken in for immediate installation and use
• Every motor carries a 30 day manufacturers warranty to cover manufacturing defects.
• 55T = 987 rpm/volt: Motor speeds taken from averaged lots at 7 volts, zero timing with no load.