It looks to me like a warded barrel key. The cut-outs are cut to pass over "wards". Wards are bumps or raised parts in the lock to keep other similar keys from working. The end of the blade goes into a slot in the bolt and pushes the bolt in, or out, of the fixed part of the thing it is locking. If the slots were in the end of the blade the slots would raise the tumblers the amount of the cuts to allow a pin in the bolt to properly line up with a slot in the tumblers before the bolt slides over. Your key has numbers that apper to be stamped in. It could be the code for the cuts. The key probably is for a lock on a desk or in a cabinet. The hole in the end goes over a pin to line up the key to be accurate. I hope my explanation helps. Unfortunately, a strongbox lock would have tumblers in it to be more secure. But, who knows, maybe someone locked up all their gold in their desk.
TimC