http://www.initialmsunglasses.com/M_VINTAGE_SUNGLASSES_COLLECTIONS/PERSOL_RATTI_9247_2.html
Persol ratti 9247 rare blue.
These are quite rare color of 9247.
Blue is everybody's favorite color which is chambray, dungaree,denim,etc.
When you want to make blue gradient outfit, you must have these shades.