Hi Michaelperth, and a warm welcome to the forum. It's great to have you aboard.

Michael, the machine you are looking at is probably a late model petrol 'Queen' and would have most probably would have been used on golf links and sports grounds. Most, if not all bowling clubs use electric "Queen" mowers (because of mower vibration of the petrol) and contrary to getting rid of them, you will find a Scotty 'Queen' lurking in the back of virtually every bowling club greenskeepers shed....most equipped with a grooming reel or broom installed.
In my opinion unless the seller has the missing covers (especially the chain case) and the catcher, at that price, just 'Tell him he's dreamin' as you would pay over $200 just for the catcher alone, never mind the covers, which would be hard to source.