Excellent answer, thanks Ted. While there may be some mysteries remaining over the model number you have told me enough that I can go for parts.

One question maybe to follow up. I foolishly tightened up the blade rotor disc without aligning the two wings on the disc boss to the corrsponding depressions in the disc. The disc boss is actually sold here at OutdoorKing,
Victa Disc Boss Late Model EE14417A

Not having done it before, I was tightening up thinking 'hmm this has a weird springy feel' until Bang! one of the wings on the boss snapped off. I kicked myself I can tell you - but at least stupid mistakes like that keep me humble. Anyhow, now I'm wondering if I'll get away with using the boss with just one wing on the boss, rather than shelling out $50 for a new part. I suppose if its only a matter of 'use it and see if it works' then I'll leave it for now.

Now that I know more about the mower frame, I'll go and order new blades
Victa Late Model Utility Blades CA09351S

One of the front wheels seems to have a broken inner rim or inner rim cover, though I haven't looked into that yet. I haven't figured out the replacement wheel part number as yet (no photos of the wheels on the online store).