97F Megatron:
Purple Background, Cannon Tilted Up 2.5 Degrees, Right Foot Tilted Down
DESCRIPTION:Megatron's cannon is tilted slightly more down than Variant 97C/97D. The right foot is the giveaway as it is tilted slightly downward. I suspect there is a 4th angle variant that has a very similar angle to 97C/97D and 97E/97F but time will tell if that can be verified.
GUIDE:
1) The top of the cannon is tilted up 2.5 degrees.
2) Right foot titled slightly downward.
