Primavera ET3 Strange Vin Number?

I'm trying t identify a scooter frame it has an odd Vin number with the letter D stamped over the stars at the front and back of the frame number.

Frame number reads as:

VMB1T D590740D

Can anyone identify this or explain the Ds?

 

Thank You

Can't explain it but it seems the complete number has been restamped.

The numbers aren't clear as those above and the allignment seems odd.

Do you have proper papers with it?

If not it can be a problem.