Identify Seagull S6

Greetings! I am trying to get some information on a 'seasoned' Seagull S6 guitar. The label has serial number 31486 putting it as a 1990 build (according to the chart below that I lifted from another thread here), which coincides with my (often suspect) memory of purchasing it at the now defunct Acoustic Revival shop in Denver in the early 90's. The label also has 503 A typed on it. I recall (with that suspect memory I mentioned) that I was told it has a spruce top and that's what I have considered it to be all of these years. However, now that I am reading more about the S6, it seems like cedar was the standard top. The top on mine has definitely matured into the rich, orange-honey color that spruce can, but now I'm wondering if it might be cedar. Also, wondering what wood(s) the bridge and fretboard are made of. Is there any way to tell from the serial number or that other number? What is the other number (503A)? Any info shared is much appreciated!

Posted photos below. The guitar has been through thick and thin and hasn't blinked. Been signed by Albert Collins, Clarence 'Gatemouth' Brown, and Willie Nelson. Recently worked over and refreshed by a luthier. Plays great, and has opened up nicely. 


SEAGULL 5-DIGIT SERIAL #'S

YEAR START-END
1982-1985: 0001-8940 
1986: 8941-10251 
1987: 10252-14386 
1988: 14387-17893 
1989: 17894-23893 
1990: 23894-33151 (serial number 31486)
1991: 33152-46661 
1992: 46662-61323 
1993: 61324-? ? ?