Handsome bike in parking area using an early Gold Wing flat four of about 1000 cc.
My guess that it’s a 750. As a single overhead cam engine, it would be pre-1978.
The Honda CB450 was made from 1965 to 1974.
On S. Congress Ave today. Looks to be in very good condition. Air-cooled 598 cc engine making 36 hp, running through a four speed. Weights about 1350 lbs. Looks like a fun ride.