The Dynamic anglewinder cars were first released in 1969 with a 16D Mabuchi, like in your first photo.
Then in 1970, as the NCC class racing took hold, Dynamic introduced a version with a Mura motor, at $11.95, versus $9.95 for the standard version. Both were eligible for the new Group 12 class - the Mura was a specifically labeled Group 12 motor.
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