Don't take this as a bad thing but at first glance, what you may have there is a collection of parts which may be a Partner 5000.
The serial number should either be on an aluminium plate pinned under the rear handle or on early models, individual numbers punched into the front of the case.
The chainbrake is from a 1979 era 5000. The starter housing from a 1987 or later 5000Plus.
The key question is what cylinder does it have? Can you take the cover off and take a close--up of the flywheel side transfer port?