Finish repair on a Baldwin Upright

[Andrew & Rebeca Anderson]

I service a light cherry colored Baldwin upright that is four years "new" 
out of the store.  There is a dent in the clear finish on the sliding 
"fallboard" that needs repair.
I'm not too familiar with finishes so here are some questions.  A divot was 
taken out of the clear finish (always, always secure the tuning hammer 
before spacing crowded strings).  I don't know if this is lacquer or 
polyester.  How can I tell?
Once identifying the finish, either or, how do I repair it?
I've got good sources for these as a finish carpenter (my other work), but 
I haven't familiarized myself with their use.

Thanks for your help.
Andrew