Some have a C= key and an Amiga key. Maybe the PO just added a 2nd C= key to be different? The early A2000 keyboard is only worth more as it is harder to find. Some people will capitalize on this and try to make extra money. I don't think it's worth $1,200! I have one and I paid less than $20 for it.
Are your C= keys red? Post a pic of it. I have a pic of my rare 2000 keyboard!