Would these missiles be 50-60 years old by now? Of course, they won’t have to fly far to hit Seoul.
Who knows what the Russkies may have stashed there over the years?
Probably the missiles are new and are from Iran, being shipped through VZ and transhipped through Cuba to N K.
That's assuming they are left over from the 60's.
It is just as likely they were manufactured more recently, and Cuba was only the middle-man.
It will be very interesting to determine the origin. I strongly suspect this is a SCUD. The question is whether the Russians will admit who they sold it to.