Sean mentioned that the 1994 regular set is hard to find and the regional set is even more scarce. While that may be true, I was fortunate enough to get a large number of the Hokkaido cards. Several years ago there was a a seller on Ebay who had a number of unopened packs that I picked up. I ended up with 29 of the 39 cards in the set (along with a couple doubles).
The most significant thing about the 1994 Calbee Hokkaido set is that it includes the first Calbee cards of Ichiro Suzuki. It looks like the set was originally only 36 cards (which would have been the same size as each of the Series from the regular set) which did not include Ichiro but then they later issued three cards of him (numbered C-37 to C-39) to take the set to 39 cards. Unfortunately, I did not get any of the Ichiro cards in the packs that I bought off Ebay (although I do have a reprint of #C-37 that Calbee issued in 2001).
The set itself includes most of the major stars of NPB at the time - Hideki Matsui (3 cards), Koji Akiyama, Hideo Nomo, Hideki Irabu, Hiromitsu Ochiai, Atsuya Furuta, Kazuhiro Kiyohara, Kimiyasu Kudoh, Tatsunori Hara, Masumi Kuwata, Masaki Saito and Tsuyoshi Shinjyo are all in the set along with Shigeo Nagashima who was managing the Giants at the time.
The design of the set was a throwback of sorts for Calbee. For the previous five years (1990-94), Calbee's designs had moved away from the simple "full bleed photo with Japanese text" design that they had mostly used from 1973 to 1989. The 1990 set either featured a bottom border with the player's name and uniform number (for the first Series) or the player's name in English (for the remainder of the set). The 1991 set also featured the player's name in English while the 1992-94 sets had actual graphics drawn on the card. This set, however, featured no graphics on the front and no English text on the front or the back (the first time since the first Series in 1989 and the last time until this year that the "regular" Calbee cards in a set would no have any English on them).
There was at least one occasion where Calbee used the same picture for a player in both the regular set and the Hokkaido set. I'll use this to illustrate the difference in the card design:
|1994 Calbee #15 (left) and Calbee Hokkaido #C-26 (right)|
|Back of #C-31 (Takahiro Ikeyama)|
Here's some of the other cards from the set. I was lucky enough to pull several of the more valuable cards from the set so I'll take the opportunity to show off:
|#C-1 (Hideki Matsui)|
|#C-20 (Hideki Matsui)|
|#C-25 (Hideo Nomo)|
|#C-23 (Tsuyoshi Shinjyo)|
|#C-5 (Tomonori Maeda)|
The Calbee Collector website has a little more information about the set.