BL8006-58AT
Citizen Eco-Drive Perpetual Calendar Watch BL8006
Light grey dial with creamy white rim and gold-plated / black hands and details
Gold-plated stainless steel case, screw case-back and bracelet
Three-fold clasp with easy push-button release
Perpetual calendar function
Water resistant 100m (10 bar)
Luminous glow-in-the-dark hands
Date display at 4 o'clock position
Approximate measurements
Case diameter: 39mm (excluding crown), 42mm (including crown)
Case thickness: 10.5mm
Weight: 158g

BL8000-54ALb
Citizen Eco-Drive Perpetual Calendar Watches BL8000
Perpetual Calendar Automatically Adjusts for Odd and Even Months and Leap Years through 2100
Charges in Sunlight or Indoors - No Batteries to Change - Ever!
When Fully Charged has a 500 Day Power Reserve
12/24 Hour Time Day & Date display
When in calendar mode, second hand points to the month on the inner bezel Dual Time Daily Alarm 
Low Charge Indicator & Time Reset Advisory in the Event it Ever Needs Charging Screw-Back Case
Non-reflective scratch-resistant mineral crystal
100M Water Resistant Approximate Measurement:
Case diameter: 38.5mm excluding crown 40.5mm including crown