The H. 264 on the front of your DVR is not a model number. It's a video compression codec; it doesn't identify which DVR you have.
The best way to identify your DVR is with the SKU number. This is found on the bottom of the DVR on the square white sticker.
You can also compare your DVR menus to the screen shots of the DVR's menu at this link:
What DVR do I have?