Just trying to remember Norm ,I saw 3 at your place and bought one alloy base 18 and one sixties steel base Victa the motor was all apart in a box and I left the other alloy 18 there ,you said you had more so possibly I bought the first 2.
I still see Victa 18 mowers for $50. to $100. , it just depends how many original parts are on them ,I still see them thrown out at the tips but a lot of the tips won't sell or let you take mowers. There were 2 free ones advertised on market place not long ago ,one still had the Auto badge. The free mowers usually go by 30 minutes of the ad being put up .
If I saw an old 18 for $150. but the mower had a rare hard to find part I'd buy the mower.