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It is the Triumph puzzle with two of the six pieces "fused" together. This puzzle is very interesting, it assembles into three different symmetrical polyhedral shapes like the Triumph puzzle but it can be very confusing to make it into the shape you want.
All of the puzzles come with a card briefly describing the puzzle with some "hints" on how to assemble and disassemble the puzzle. So take care (maybe even notes) when you disassemble the puzzle so that you will be able to reassemble it.
Note: You should not have to force any pieces apart or together. However, because of the nature of the wood, humidity may effect the way the puzzle will fits together.