You say there is no registered Will but there is a plain paper document in your
favour. If the testator signs that paper in presence of two witnesses, then it
is a valid Will. On the basis of this, you can take the probate from the Court
and then sale/transfer is legal. For your kind information I may add that it is
not necessary that the Will may be on the stamp paper and registered document.
It can be on a plain paper also and the requisite condition is that the testator
making the Will in presence of two witnesses should sign it.
It is presumed that you must have completed all the formalities of MCD before
getting the mutation done in your favour. You can get it registered in your name
on the basis of Will by paying registration charges and completing formalities
as prescribed by the office of Sub-Registrar.