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  |      V O L S K W A G E N W E R K  A G       |
  |              MADE IN GERMANY                |
  | Typ 23-42                                   |
  |      * Heizg Typ 2/255A Prutz....545 *      |
  |      fahrgest-Nr 236143257                  |
                       <---------------------  this number.....
  | Zul Gesamigew.Kg  2070      Baujahr         |
  | Zul AchslastwornKg 950      [b]intenKg 1150 |
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- - - - -

indicates that it is a type 23 - kombi made in model year 66,   the kombis is
what westfalia made into campers.

"Liz also discovered grey cardboard headliners in the cab "
this confirms it- microbuses came with vinyl(64 on)or cloth (to 63)
headliners

as a 66 rather than 67 you would have a push button on the rear hatch rather
than the latch kind you can hook your finger around to pull up.  67s have a
larger dash radio hole.  66 has a rectangular hole for the radio, and a small
round hole on each side for the knobs.  67s came with a dual circuit master
cylinder.    campers were usually one colour

i suggest that someone had your bus (66 camper) and no title to it, so used
the title and tag ffrom a junked 67 deluxe.    whether or not they welded
bits together i dont know.   buses do not have separate pans like beetles do.