Most C10 Skyline models came with 2 sets of the following keys:

• Ignition Key - Boxy shape with large 'N' in the center
• Door/Trunk/Fuel Filler Cap Key - Oval shape with 'NISSAN' on it

The KPGC10 model Skyline GT-R came with 2 keys that worked on all locks and ignition.

• Ignition/Door/Trunk/Fuel Filler Cap Key - Oval shape with 'NISSAN' on it