Found an old stock certificate, not sure if it's a worth anything?

I found a certificate for shares of the common stock of Mortgage Discount and Finance Limited. It's from 1921 and was worth $120 at the time. How would I go about finding out if this has any value?

Submitted February 12, 2017 at 10:51AM by KevPat23 http://ift.tt/2kgPO9n