[gordon]

In the absence of a cab plate ( I'm assuming there wasn't one as no photo ) I'd be looking very hard at that front chassis rail for an eight digit number starting with a 9

While I'm on, it was contemporary practice to mark the chassis PART NUMBER mid wheelbase between the spring hangers with the same size and typeface of stamping, so don't get distracted by that. It is quite easy to distinguish the PART NUMBER stamping as it is very clean, neat, and heavily stamped absolutely square with the chassis, where the CHASSIS NUMBER was stamped quite approximately with a hand held block and usually a lot fainter.