OK, there´s a VIN decoder:
www.autobaza.pl , click on English. Then enter your VIN. in my case, 1FAPP1288NW169549:
1 COUNTRY OF ORIGIN: UNITED STATES
F MANUFACTURER: FORD
A VEHICLE TYPE: PASSENGER CAR
P RESTRAINT SYSTEM: PASSIVE BELTS
P LINE FORD
12 BODY STYLE: ESCORT GT 2DR HATCHBACK
8 ENGINE: 1.8L EFI DOHC I4
8 CHECK DIGIT: CHECKSUM: OK
N YEAR: 1992
W ASSEMBLY PLANT: WAYNE, MI
169549 SEQUENCE NUMBER: IN RANGE
On my VIN, the N indicates the year, which is right...1992. Even though it was built in December 1991 (look at your door sill), and 169549 means my car was that number Escort off the assembly line.
The three piece spoiler like mine is just that, it´s 3 pieces and it wraps around the rear quarter panels, while the newer spoilers are one pieces and sit on the top of the trunk lids.
Oh, and the Escort was never built ina trim level "GL" you´re thinking of the Contour
Escorts came in "pony" (basic, no power steering, etc) L series, LX, GT, and LX-E (4 door with GT engine and suspension). and then there was the Tracer versions. I´m not too big on them, but they came in the basic level, then same as LX, and then the LTS, (which had GT engine and suspension).