Thanks Max, don't know why I didn't notice the sticker on the air filter..........

Model # VAS 201 H
S/N 0738-51.00

And now I know it's a LM/Late Model G4 that wil help me sorting the carb. I have a few other Victas with similar carbs but haven't needed to delve far into them because they run OK. Just noted this one has a split in the primer rubber.

Won't have time to get into this mower for a few weeks, it will keep. Seems to be worth fiddling with though, am using plenty of machinery that is actually much more tired than this :-)