the older clam variant, seen on early Norwegian MTB's specially Storm class:
The upgraded version that had a simpler construction. used on Hauk class MTB's and Oslo class frigates, but also used by US navy and Japanese navy as on both small boats as part of land defence:
A new variant that I have found recently, but haven't managed to get any information about, just the sketch-drawing of it, indicating it never went further that that, as it is a good enough plug and play system from before.
The launcher reminds a little on a modified MK25/Mk116, but are most likely a new design. Although the drawing look like a ship installed system, I can't see the value of having a small/medium combatant carry a large amount of ASuW missiles, I see it as a more practical installation a part of a complex coastal defence system. But if the launcher was combined with another missiles...:
