Re: Merc manuals 3 & 4 online
It looks like an Alpha, and Merc does make replacements for the One drives that look exactly like that.
BUT, that will only mean that the manual you need for actual internal repairs of the drive, will be manual #6. For the transom shield, steering, trim, bellows replacement, shift cable replace and adjust, you need manual #4.
Why it has an Alpha on there without you knowing is way beyond my abilities. Might ask other family members if they know, but I am quite sure no one else here know the WHY of it either.