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.