I believe you actually have a '64 Safari here. I count 5 end cap panels. '63 had 7 end cap panels. The "mid ships" curbside door also gives it away as a '64. If I am right, your side windows (not the Jalousie's) are unique to '64 California built coaches as well. I started a thread about '64 Mystery Side Windows
linked here. Just to confirm, see if you can pull the serial number from under the Curbside Front Jalousie. My guess is your trailer is built in '63, but it is a '64 model.