Not sure if this one is hard to find with regard to scarcity for Zeenuts, but it is difficult to find almost any Zeenut if you are looking for a specific player..
Here is Rube Geyer on his 1914 Zeenut card. He played for Oakland in 1914. Next to it is Geyer's T213-2 Coupon card pictured with St. Louis, whom he played for 1913. This leads me to believe that T213-2 Coupons were issued between 1913-1916. Most checklists that I have seen state 1914-1916.
