Who Manufactured This Piston ?

Sorting through the boxes of spares I recently bought, there are 4 high compression pistons that are marked MP where the P is part of the M followed by what would appear to be a part number.

They have 2 compression rings and 1 oil ring. Any ideas as to who made them ? Thanks, Andy

 

Their catalogue only has one piston for a Ducati and that is for a 250 but thanks anyway. Andy

 

I am advised that the pistons are supplied by Ducati as original equipment. The only issue now is to decipher which of the 3 options that were available the pistons I have are. Andy