The metal mesh screen was what Victa fitted to their entry level 2-strokes, back then [it was a carryover from the 1950's Victa 2-strokes]. Old plastic bits typically get brittle and crumbly with age, and this part is long unavailable. Those rubber snorkels are not available now either, though there is still the odd NOS one to be found.
At that time, the higher end mowers with snorkels got paper cartridge filters, and the non-snorkel models had either paper or oiled foam filters.
The engine number dates this one to 1966, so it could be either of a 17N or 17CG engine.
However, that doesn't make any practical difference, really. While the magnetos are slightly different types, the replaceable parts [points and condenser - the coil has now been discontinued] are identical, as are the more commonly replaced engine parts - seals, gaskets, rings and bearings.
A PDF download of the original Victa 'Green Book' parts list, which covers these magnetos and the 3L carby is
HERE .
New [tho' non-genuine] blades are still available; Victa part numbers are CA09150S [cutter] and CA09174S [lifter]. Both use Bolt/Washer set CA09164S.
