Epoch One is essentially Epoch's version of Topps Now. Epoch makes cards available on their website for 500 yen apiece for a short period of time (seems to be around three days which is longer than the 24 hours Topps Now cards are available). The print run for each card is determined by the number of orders of it. The cards commemorate notable events during the regular season, the Climax Series, the Nippon Series and the NPB draft (held in October).
Epoch did a total of 680 Epoch One cards in 2018. For some reason they only did them for seven of the teams - the Carp (113 cards), the Dragons (84 cards), the Fighters (94 cards), the Giants (102 cards), the Lions (120 cards), the Marines (74 cards) and the Tigers (93 cards). Each card has two numbers on it - the overall card number (1-680) and the team specific number (the Giants cards are YG-001-102, the Marines cards are CM-001-074, etc).
I have 11 of these cards - the 10 I asked Ryan to pick up for me plus another one I got from someone on Amazon.
I don't remember what all of these commemorate but I know that I have the cards for Kioymiya's first hit, Yamaguchi and Sugano's no-hitters and a sayanora home run for Kimura. I was aiming at getting at least one card per team and I also wanted to pick up cards showing alternate uniforms for when I get around to updating my uniform posts.
Here's what one of the card backs look like:
You can see the overall card number in the upper left corner, the team specific card number in the lower right corner and the print run in the lower left corner. The cards are not serially numbered.
I'm a bit surprised at how low some of the print runs are. Eight of the cards have print runs of less than 100 with the Iguchi card being the lowest at only 39. The Yamaguchi no-hitter card has a surprisingly low print run of 93. The Mysterious Fish card has a run of 109 and the Sugano no-hitter card has a run of 234. On the other end of the spectrum, the Kiyomiya card had a print run of 1775! (I don't think the print runs are on-line on Epoch's website anywhere.)
One weird thing I noticed - it looks like most of the cards except for the Lions cards have a different photo on the back than the front. But for whatever reason all the Lions cards appear to have a cropped version of the front photo on the back:
As with other things Epoch did in 2018 I'll be curious to see if they continue doing Epoch One cards in 2019. I wouldn't mind getting some more of these. There are many available on Yahoo! Japan Auctions - a lot of them are priced at 756 yen but I've seen a couple as low as 400 yen.