I thought it was a Stihl at first but it looked too complete and sure enough it wasn't.
I was about to leave it when I got a light bulb moment and thought about a spare engine I had that, from memory, was the same as this one. It was.
My engine has a missing air cleaner cover which this trimmer has.
The head is stuck and won't spin. There looks to be string caught behind what's left of the trimmer head.

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Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!