Badge "Hundred Thousandist".

[Pobeda45]

I enjoy any transportation design badges...this one is great with the truck, steering wheel, and blue background. :thumbsup Likely 1950s-1960s?
From the limited info I can find online, this badge was awarded for driving without repair or accident for 100,000km.

[CtahhR]

I believe it is without accident or repair (that the operator couldn't handle). 100,000km is the minimum award (c60,000 miles).
With this being a Kommuna made item it is 1950's.
It will have a relating document somewhere. The roads of Bulgaria were considerably more modern than the average road in the Soviet Union at the time (or even now).