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=671640" 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|
|191135||Steam Sub 191135||CD Key||September 4, 2017 – 18:02:59 UTC|
|191136||Steam Sub 191136||CD Key||September 4, 2017 – 18:02:37 UTC|
|191137||Steam Sub 191137||Store or CD Key||October 11, 2017 – 14:50:29 UTC|