Hello neo,
I would reach out to the lock museum. They might be able to send you information (drawings, and a picture out of the catalog).
http://www.lockmuseumofamerica.org/home.aspx
I haven't found a match to yours but Reese put out CYCLE padlocks.
https://www.google.com/search?hl=en...KHQ9SAqgQ4dUDCAc&uact=5#imgrc=VyGSlt4ouv2gYM: