Ok...what do we have here....
The 6261 in theTRIM area is Brown leather upholstery with vinyl trim, an interior specific to the 1951 Frazer Manhattan Convertible. It was originally intended for sale (or to stay within) in the 48 United States. The original transmission was 3-speed manual with overdrive (TR 4) and the standard Frazer accessory group (AG 5) was installed on the car.
Now life gets interesting. WL or Window Lifts indicate that the power windows were factory installed; the system is a DURA hydraulic type with the power top tied into it. The SPEC-FO number indicates that the car deviated from what was considered standard equipment. In this case, the 3-speed manual and/or the power windows would fit the bill, but the most interesting part of this is the SCHED, ITEM and BODY numbers. SCHED refers to the build schedule the body was part of. Normally SCHED numbers are dates in the model year...in this case SCHED 1 is March 15, 1950 when production of the 1951 model year cars started. Get a calendar showing 1950 dates and move 16 business days ahead; that would be the approximate date the body started down the body line (not final assembly) and the 331 suggests starting in the afternoon. This is the 4th 1951 Frazer Manhattan convertible body scheduled to be built, and would have been used for PR photos, special showings, etc. The serial number suggests that at time of assembly, it would have been possible that 4 convertibies and 2 hardtops already rolled off the line...again consistent with needs for display.