How old is a model automatic pistol cal 635 serial number 3300?

To determine the age of a model automatic pistol with a caliber of .635 and serial number 3300, you'll need to identify the specific manufacturer and model. The serial number can often help trace the production date through the manufacturer's records or databases. If you provide the manufacturer's name, I can help you find more specific information. Otherwise, you may need to consult a firearm expert or reference a gun collector's guide for that particular model.