Keisei - Tokyo Metro 1-Day Expiration?

I went to Japan last May and took advantage of the Keisei Skyliner Round-Trip discount with a Tokyo Metro 1-Day Pass

http://www.keisei.co.jp/keisei/tetudou/skyliner/us/special/index.html

I never used the Tokyo Metro 1-Day Pass - is there an expiration date on the card itself? Might anyone know?

Kind regards!

I have one of those passes as a souvenir and I don't see anywhere where there might be any expiration date on a pass that hasn't been run through a machine. Once you do, the date you used it is printed on the back. Those passes must be mass produced and it must be nearly impossible to put an expiration date on them unlike the SUICA which is much more "intelligent"....

Thanks, John. I wonder too. The SUICA cards expire after 10 years of non-use or something lik that I think :) So I'm hoping I can use this 1 day pass on my next trip in the coming year.

I don't have an answer - but thank you for posting this, I hadn't come across the Skyliner round trip ticket before! You just saved me some yen! :)

My pleasure! :)