SONOC Quinto or Requinto?

I just bought a Sonoc drum (probably built in 1991) with a diameter of 10". Is it a Quinto or Requinto?

I´ll get it in january. The skin is rather thin (1,5 mm). Would it make sense to replace it with a thicker one?
p.a.dogs1

I´ll get it in january. The skin is rather thin (1,5 mm). Would it make sense to replace it with a thicker one?
p.a.dogs1