Picked up the above today, the dial throttle control is a bit of a novelty. There has been a bit written in forums on this engine and it does look an original fitment. The other thing to note on this mower is the lack of mounting holes on the upper handlebar for the installation of a more traditional throttle control lever, unless the upper bar was replaced but doesn't look to have been. Model MT 341A1
Thanks for the link CJ. Very easy to lose track of some golden threads here. I do appreciate the Google facility above though. It has helped in tracking down old threads I know of at least.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!