Hi Peter
Another 'push me-pull me' Cessna :
Ce 337D c/n 337-1091 (3371091)
This one is still current as N19P
http://www.airport-data.com/aircraft/N19P.html
'Pee Kay' on the tail probably refers to De Vore's, line of floats / pontoons for small aircraft.
Cheers
John