Good find mate it's pretty sun faded there but it looks like you have a nice solid alloy deck with no major cracks or bits missing from what I can see. I have found 2 alloy decked Victa mowers here and both decks are cracked and chunks are missing from them.
I can just see the original Powerplus decal on the front of the plastic cowl. I had a look and it's featured in the Victa 1982 booklet as the Victa Powerplus lawnmower. Nice one with the factory electronic ignition system on that model.
Cheers!
Zip a dee doo dah, zip a dee ay, another trash picked Victa, hip hip Hooray!