After watching some videos I'm pretty sure that the BB on my bike is a three piece square taper type.
After a short search I couldn't see any any videos or articles on how to remove a BB which has the 20 groove cups (?) and a lockring.
The bike is Pinarello Lungavita single speed. I bought it second hand and I cannot find any info on what the BB is.
Would you be able to figure out what BB it is and what the locking is for?