JY 13 was a premium, included at the rate of one per box of JY 1a Yamakatsu Giant Color Bromides. The premium consists of a folder with a color image of Sadaharu Oh and Isao Harimoto taped to a large piece of white cardboard containing an orange and black Giants logo. Inside the folder are two borderless, color postcards. One postcard commemorates Oh’s 700th home run. The other was issued in honor of Harimoto’s 2,500th hit. Also included is a sheet of yellow paper with statistics related to Oh's quest for 700 homers and Harimoto's road to 2,500 hits printed in Japanese. Oh and Harimoto ultimately surpassed these career totals by quite a bit, as Oh ended his career with 868 home runs, and Harimoto finished with 3,085 hits.

Size: Display--7 3/4" x 10 1/2". Postcards--3 15/16" x 5 7/8".

Condition: Postcards and sheet--Nm/Mt unused. The folder exhibits a bit of mild scuffing on the Oh/Harimoto image, but is otherwise in outstanding, unused condition.