The MB&F Horological Machine Number 2 has enjoyed a really rich life. The ‘wrist rectangle’ is now going into its final limited edition production with two new models. These are the HM2 Black SV and Red SV. “SV” stands for Sapphire Vision. The whole point of the Sapphire Vision watch was the massive sapphire crystal that made up the front plate of the piece. The crystals were ungodly expensive to make and a tortuous trial in patience as many would break in the manufacturing process. One you make the crystal and it is stable, they are relatively strong, but the weakness is in making them.