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=673520" 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|
|191721||Steam Sub 191721||CD Key||November 7, 2017 – 19:24:29 UTC|
|191722||Steam Sub 191722||CD Key||November 7, 2017 – 19:38:24 UTC|
|191723||Steam Sub 191723||Store or CD Key||July 4, 2017 – 16:10:28 UTC|