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(These "PLATE" articles are intended as a primer on the vehicle license plates appearing in the whole of the Perry Mason series.)
LICENSE PLATES. From 1956 to 1962, all California Vehicle License Plates were the 1956-Pattern having chrome-yellow base color with black characters. This so-called "Yellow-Plate" was a "Mandatory General Issue" of a pair of front & rear plates in January 1956 replacing all previous plates on all vehicles. For 1956, front and rear plates were identical, with no Validation Tags or Stickers affixed, just as in the linked image. For subsequent years, a single Validation Tag was affixed along the top of the rear plate, as on this 1960 rear plate.
      The '56-Pattern was completely replaced by the Mandatory General Issue "1963 Black-Plate" which was California's last general plate re-issue and the sole California base-plate until end-69. Wiki article with full history here. Also see this 2012 news. Genuine plates during Perry Mason filming were:

  • 1956: Pair of 1956 black-on-yellow plates, no sticker.
  • 1957: 1956 plates with 1957 sticker (black on red).
  • 1958: 1956 plates with 1958 sticker (white on green).
  • 1959: 1956 plates with 1959 sticker (black on ivory).
  • 1960: 1956 plates with 1960 sticker (silver on blue).
  • 1961: 1956 plates with 1961 sticker (silver on red).
  • 1962: 1956 plates with 1962 sticker (green on ivory).
  • 1963: General re-issue, pair of yellow-on-black 1963 plates, no sticker.
  • 1964: 1963 plates with 1964 sticker (black on white).
  • 1965: 1963 plates with 1965 sticker (black on orange).
  • 1966: 1963 plates with 1966 sticker (black on yellow).

In this Episode 99, the rear plate on Marjorie's Mercury is shown twice in close-up at 1:20 & 3:41. The plate can be seen to be authentic, with what appears to be the correct 1960 silver-on-blue sticker. The front plate of Lucy's old Chevy is seen as she leaves her apartment (10:06), then twice at the dock (the second time is just after the screenshot at top of this page). It's only the front plate shown, so we don't see the year sticker. I am convinced that:

  • the regular passenger-car License Plates seen throughout Perry Mason are genuine and
  • the plates seen on each car are almost always the plates actually issued for that car by the California DMV. I write "almost" because there are at least two sets of Rogue Plates which appear on different cars in different episodes: DHR 786 & KYL 907. See Trivia, Ep#s 44 & 51 and Comments Ep#107.

Added by Gary Woloski 9/15/12, revision 4/9/14.

"EXEMPT" PLATES. The strange symbols on police car license plates are "E"s in diamonds or octagons, indicating "Exempt" Plates. In the State of California, Exempt Plates were issued for vehicles owned or leased by federal, state or local government or by certain non-profit organizations (eg: Red Cross, volunteer Fire Depts in unincorporated areas). They were called "Exempt" because the agencies were exempt from paying vehicle registration fees. Nearly all of the "Exempt" plates seen in Perry Mason are props (FAKE).
      Genuine Exempt Plates were the same size and color-scheme as the general-issue plate of the day and were embossed with the exempt designator followed by either five or six numerals. The "Exempt" designator symbol was:

Up to mid-Season 6, the only authentic Exempt Plates I've spotted in the series are:

  • E 19400 on LAPD B&W 1957 Ford Custom Fordor Sedan in Ep#1,
  • E 91605 on SAN DIEGO ZOO 1956 Chevrolet 150 Handyman station wagon in Ep#117 and
  • E 78975 on U.S. FOREST SERVICE '57 Ford Custom 4-Dr Sedan in Ep#138.

All the rest of the "Exempt Plates" up to mid-Season 6 are props. These might have been fashioned by affixing a card (imprinted solely with an "Exempt" symbol) over the first three characters (letters) of the regular passenger-car plate issued to the "POLICE" replicar used in the show. Examples:

  • fake plate E 313 on LAPD B&W 1958 Plymouth 4-Door Sedan in Ep#46 and
  • fake plate E 943 on POLICE B&W 1959 Plymouth Savoy 4-Door Sedan in Ep#56.

The images linked-to above illustrate the '56-issue yellow-plate. During Season 6 the prop "Exempt" plates switch to black-plates at the appropriate time.
      As of Year 2013, the "E"-in-octagon and -diamond symbols are being phased-out and replaced by a simpler design with "CA EXEMPT" written across the top edge. Phase-out began perhaps as early as 1999. At mid-2013, the CA DMV website stated "DMV will no longer issue diamond and octagon designations when current supplies are exhausted, although both will remain valid." Added by Gary Woloski, 7/16/13.
References: (1) Encyclopedia of American Police Cars by Edwin J Sanow, esp. p38 (CHP caption). Also, cover photo & its description on "Dedication" page.
. . . . (2) Police Cars - A Photographic History by Monty McCord.

I wonder where Lucy Stevens picked up that technique for ditching the car? I don't think I would have placed such confidence in the parking brake on an old heap like that. JohnK, 3 October 2015

+ Old heap? From YOUR perspective in 2015 maybe. However, at the time the episode was filmed it was a brand new, state-off-site-art vehicle. Back then parking brakes WERE reliable, and COULD stop cars. In fact, the technique used by chauffeurs to do a high-speed 360į to avoid a potential hijacking ONLY works on a car with parking brakes like that. Another few years later the parking brakes automatically released by putting the vehicle in gear; then it was much easier to fake a suicide :p - Submitted by Arisia, 03/07/18

Marjorie Ralston must have had a lot of time on her hands, since I counted about 12 bundles of money, each one containing about 250 pieces of newspaper cut to the size of a $20 dollar bill. That would be 3000 pieces of newspaper cut up. Surely she could have used something a little less time consuming to take the place of the real money.
+ And speaking of the cut up money, why didnít Locke or Burnette think to examine the cut up newspaper for a date and the name of the newspaper. Since Lucy Stevens had just flown in from New York, there would have been no way she could have cut up 3000 pieces of an old Los Angeles newspaper. Submitted by PaulDrake 33, 10/24/2010.

+ She could have planned it in advance and taken the cut paper with her or left it in an airport locker. Added by H. Mason 11/1/14

+ How did Marjorie Ralston's body get into Lucy's car? That is, without Lucy noticing and recoiling in horror? Granted, cars were a lot bigger then, but wouldn't she have noticed a body in the back seat of her coupe? JohnK, 25 December 2015