Looks like an alloy head on the Hurricane 2 stroke motor and the starter pulley looks to be the later one so I would say it's late fifties
to early sixties.
No information has survived on these rare Gardener mowers apart from what is on ODK.
People Who Might Know:
Old Mower Shop Workers: , people who worked in small mower shops in the 1950s and 1960s could be some of the few who remember the Gardener 18, especially if it was sold locally or regionally. Itβs possible that even some of the shop owners or repair technicians who handled them might recall specific details, especially if the mower had quirks or was unusual for its time.
Realistically, though, anyone who was actively working in a mower shop in 1960 would likely be at least in their 90s today. So, finding someone with direct knowledge is rare, and even if you do, their memory of obscure models might be a bit hazy.
What has already been exhausted looking for info on this model.
Online Forums/Groups
Vintage Mower Restoration Experts:
Old Manuals/Ads
Cheers
Max.