This is the 1985 Bangladesh Scout overprint variety.  TYPE1 and TYPE2 in pair joint and separate Bengali letter "M and B" in Jamboree.  Look at the middle letter.

This Taka 5 issue honors the Third Bangladesh National Scout Jamboree, 1985-85.

"Violet" color shift, with 2 variations: hand shifted left and right.  Look at the "white" border around hand.