Dan,
Welcome to Chat. Most of us are friendly and will try to help (except for a couple of grumps). There should be a "Car No." plate nailed to the main wooden sill near the passenger's right foot position. The will have a number stamped into it with the format: number (one or two digits) AA (year model designation for '27) number (sequential beginning at 1001 for each factory). That is the vehicle serial number. Legally it is not a VIN even though most refer to it as such. Most other '27s have the plate nailed to the front seat riser but the Coach (2-door) does not have a seat riser.
The Job # and Body # identify the body type, manufacturing plant and sequence number.
