6R15

• 21,600 vibrations per hour
• Duration of full charge: Over 50 hours
• 23 jewels
• 168 parts
• Hand winding capability
• See-through case back
• Engraved rotor

6R20

• 28,800 vibrations per hour
• Power reserve indicator
• Duration of full charge: Over 45 hours
• 29 jewels
• 208 parts
• Hand winding capability
• Engraved rotor
• See-through case back