Just getting into the hobby and came across this postmark on an old postal card dated August 29, 1884.

The one is question is in the bottom-left. Large bold capital "H", "8-29", "3 P" (one hour after the other postmark).
The other postmark I'm a bit more familiar with; however, I don't normally see the year outside the cancellation. "New York", "Aug 29", "2 P", "PO", and "84" outside the postmark. The oval cancellation has 6 vertical bars with what appears to be "30" within a circle.
Anyhow, I was wondering if anyone has seen the postmark with the big "H" in it (or something similar) and knows anything about it.
Thanks!