There were three differences between the late '52 and '53 Kaisers when viewing from the outside:
Hood ornament is different - '52 has a plastic "wing" and tip but the '53 is an all chrome airplane..
The '52 has outside trunk hinges, the '53 does not.
The '53 has the fender "spears" trim on the top of the rear fender and the '52 does not.
This one looks like a '52 which had the '53 fender trim added on the rear.
And, there is a fourth difference - the '53 Manhattan, Dragon and Deluxe have different headlight trim whereas the '52s have simple headlight rings as all other KF products do.
My guess is if you ask the seller, they will say "It's all original."