Atco 8/30 could be an original Atco , in which case it will be getting on a bit and may be problematical for parts; or may be a “ modern” Atco which is a re- badged Stiga. If it has a Briggs and Stratton engine, look at the Model, Type and Code numbers on the engine and the Code will tell you it’s approximate age. ( always assuming it’s not been re- engined !!)