This app has been deleted or is hidden to the public. There is extremely limited to no information about this app.
We don't even have a name, hence why we are displaying SteamDB Unknown App "AppID".
If you see someone screenshot a page like this and add some information/images on it, it is most likely fake.
Every change is tracked in history, and can be directly linked to.
<iframe src="https://steamdb.info/embed/?appid=663720" height="389px" width="100%" scrolling="no" frameborder="0"></iframe>
Initializing graph of a week…
Initializing graph of a year…
|SubID||Name||Billing Type||Last Updated|
|188362||Steam Sub 188362||CD Key||July 24, 2017 – 13:53:43 UTC|
|188363||Steam Sub 188363||CD Key||June 20, 2017 – 19:11:23 UTC|
|188364||Steam Sub 188364||Store or CD Key||June 20, 2017 – 19:11:23 UTC|