I doubt it. I suspect that the block attached there originally, but they moved it forward a foot or so. The mizzen sheet starts by being tied off to the becket on the end of this block, which I circled in green. From there, it goes through the block that is attached to the transom. After that, it goes through the main portion of the block with the becket in it (in this photo), and forward to the block at the forward end of the sprit. From there, it goes down to the center jam cleat.