Appears to be from Germany.
4" in diameter. To open the lock: first turn the "nose" on the front of the lock to expose the keyhole. Then screw the key in. After the key is screwed in, then pull back on the key, then rotate the key to open. Steel. Good condition. With the original key. - eBay (28 Sept 2009)
This padlock had a high bid of $227.50 (Plus $7.95 Shipping).