Looks to me you have a Sisis Auto Trak which was made for use on hard porous areas, the give away is the shortened handle bars, looks like you have a MAG engine on it, which I think from memory is an SR1, from that I deduce the age to be from 1978 to the early 1980’s, parts and attachments usually can be found in ex- municipal auctions

The origins of the Sisis Auto Trak, was first called a Ransomes Hargreaves which would have had a large JAP engine and be from the 1950’s, they then changed the name to Ransomes Sisis Aero Main, from the early 70’s Sisis went out on their own, dropping Ransomes.
Hope this helps