Here is a very hard to find antique miniature Copper Wheat penny trick padlock. Condition is excellent. It was made from two copper pennys, one is dated 1937. The entire lock measures only 1 inch long, 5/16 inch thick, and 3/4 inch across. Not much of a trick though still a very unusual padlock perfect for display. You push the spring loaded button and the shackle pops up and turns 45 degrees.
This is a very hard to find lock. - eBay (5 Sept 2010)
This padlock had an opening bid of $150 (Plus $7.70 Shipping) but had no bidders.