A/C was owned by Blackhawk Technical College at time of photo in 2012. A/C was assigned FAA reg. N604DK in 1997 but that doesn't appear to have been painted on the airframe.

Built in 1962 and registered as N1557S. To N604DK in 1997. N770DA allocated in 1999 but not taken up. Withdrawn from use at Janesville, WI in 1999. Still there in 2016.

When I posted this picture on a Beech 18 FB Group, I received this interesting additional info from Bob Parmerter: This nice conversion of a surplus C-45H to a high cabin trigear G18S, with panoramic window, was done by Volitan Avn, Pacoima, CA in Jan 63. I believe that at the time this picture was taken it had been seized by the Collier Co. Sheriff (not sure why), then auctioned by them in Apr 80 to L.R. Pike, Everglades FL., for the low price of $13,500. Not sure if it flew after that (no 337 forms in the file) & was reported as "destroyed/scrapped" by same owner in Dec87. Thanks Bob.