I think you'll have trouble getting Honda to admit that your GL1200 is actually a Honda. They tend to abandon the older bike owners in terms of support, parts, etc.
You can always check the NHTSA recall database, that works for any vehicle:
http://www-odi.nhtsa.dot.gov/recalls/recallsearch.cfm
A search there shows the only recall for your bike is this one:
Make: HONDA Model: GL1200
Model Year: 1984
Manufacturer: AMERICAN HONDA MOTOR CO. Mfr's Report Date: MAY 25, 1984
NHTSA CAMPAIGN ID Number: 84V067000 NHTSA Action Number: N/A
Component: ELECTRICAL SYSTEM:IGNITION:SWITCH
Potential Number of Units Affected: 28,750
Summary:
SWITCH COVER WHICH PROVIDES FOR A GOOD WIRE CONNECTION COULD BECOME LOOSE AND POSSIBLY CAUSE LOSS OF ALL ELECTRICAL FUNCTIONS.
Consequence:
Remedy:
THE IGNITION SWITCH WIRING HARNESS WILL BE REPLACED ALONG WITH THE SWITCH COVER. THE COVER IS INSTALLED TO ENSURE PROPER WIRE CONNECTION.
Notes:
VEHICLE DESCRIPTION: MOTORCYCLES.SYSTEM: ELECTRICAL; IGNITION SWITCH WIRING HARNESS.CONSEQUENCES OF DEFECT: ENGINE COULD SHUT OFF WHILE VEHICLE IS IN OPERATION,POSSIBLY RESULTING IN AN ACCIDENT.