Because of regulations imposed by the government reflecting American involvement in the Korean War (kind of like the World War II production restrictions to a much smaller degree) car companies had to get government approval for price increases starting late in 1950. There was a price increase on Kaiser automobiles in late summer 1950 before the HJ came out. Speaking just for the Henry J, the original price as of the end of September 1950 was in place through March of 1951 when the Office of Price Stability (OPS) allowed price hikes on current production 1951 Kaiser and Henry J automobiles (all the 1951 Frazers to be built came off the line by the early part of November 1950). The Federal Excise Tax on cars went up from 7% to 10% at the end of October 1951. Equipment offerings changed due to restrictions (like spare tire and tube being discontinued for part of calendar year 1951) or company policies.
All this is documented in KFOCI HANDBOOK. Oh, forget the paper versions of the Handbook unless you want to collect old history. The handbook on CD is better researched than the paper versions because of the access to Confidential Bulletins, Parts & Accessory Bulletins, Service Bulletins and other factory materials I have. The Handbook even shows how dealers were instructed for two-toning of Henry J's.
If you are looking for copies of factory materials, e-mail me with a list of wants (which types of bulletins, factory correspondence, etc) and be as specific as possible (HJ prices and equipment not just 'Henry J information") otherwise you could get hundreds of pages worth of things you don't really want. DO NOT EMAIL ME HERE ON THE FORUM. Use the email address for the Club Historian as found in each issue of KFOCI MONTHLY BULLETIN.
