Can you tell me the type of stamp this is. I've done some investigating but still no luck on how to identify this type.
Answer I do not understand why you haven't found any info? Do you own a Scott catalog? The U.S. Specialized catalog contains lots of info which would help you to figure this stamp out.
It is a coil stamp, issued sometime after 1912 (which is the year that particular design was first introduced). It is a paste-up stamp, which was the place where the strips of stamps were pasted together so that a roll of coils could be made. It appears to be perf 10 and if so, it is very likely the 1914 coil, Scott #444. If it is perf 8.5, then it must be Scott #413.