Selle Italia SLR TM Flow S2 saddle

can confirm the size is S2

Size characteristics:

S saddles are narrow with a sitting point width of 131-136 mm 
L saddles are wider with a sitting point width of 145-150 mm
FF (Friction Free) saddles have a tapered nose to minimise thigh chafing
1 means no hole is present for riders with low pelvic rotation
2 means a medium sized hole is present for riders with average pelvic rotation
3 means a large hole is present for riders with high pelvic rotation