I'll say large date because if you extend a line and continue it down from the end of the loop of the nine it goes southeasterly. If it were a small date the line from the end of the loop of the 9 would go more northeasterly than this 9's loop.
Here is something @spirityoda posted once and it really stuck with me. and here is that thread which you may find interesting: https://www.cointalk.com/threads/1970-s-penny-small-or-large-date.264311/