^ What MillionsKnives said. Ginsan aka ginsanko aka G3 is just the type of steel they use in the core. You can tell it's san-mai because of the cladding line in the picture. That's the wavy line by the edge, not that secondary bevel line closer to the spine.
I believe only the Ultimatum HD is made by Konosuke. I'd imagine Lamson or some other American OEM makes the regular heavier duty line of Ultimatums.
I'd say getting your dad something a little stouter makes sense. If I were in a position like I understand yours to be, I'd probably go with a Mac Pro 270mm (MBK-110) or Ultimatum AEB-L 240mm for the gift, depending on whether my father had an adequate size cutting board or not. Then I'd either wait on the Konosuke HD if I really wanted to try out the semistainless alloy, or I'd get a Richmond Laser or Gesshin Ginga now.
I was looking at this post, and that I mentioned before about bad reviews, and noticed you were the one who was commenting on the knives and their "grind issue." I guess it's not a big deal, and doesn't affect performance, just looks?
I don't know where else I saw a bad review on them, maybe it was just your comments, but I thought there was 2 separate comments on them...
There seems to be very good reviews on both the 240, and the 270. I'm curious if it's worth it to go for the 270(262mm total), because I do like that handle better, but not sure if it justifies the price increase/size increase, or if I should stick with the 240?