Here is another great antique warded key.
These auction online is for Antique french key with a large size from 1900's. Measure 5,5" long 14 cm - eBay
The seller of this key has many more old keys for sale.
Imagine needing to get a spare key made up for this! It has a buy it now price of $190 (Plus $3.95 shipping) So far no buyer.