manufactured ship

Hello, i thought i had to reach max synenergy on level 15 ship to unlock manufactured ship( Saw One). What do i have to do to unlock this ship? In ship table its written that i have to unlock 4 more ships, but when i buy new ship the count does not change.

The ship you buy must be of that faction, so for your Saw One it must be a Jericho ship that you had previously not had.