I like the 1809 as in my view it was sort of the last year of them working out the kinks in the design, after 09, things get somewhat more stable in the series. It also has the most die marriages of the 07-09 period (15 vs. 10 in '08 and 4 in '07) making it also more available and affordable. Lastly it has some interesting edge variations (so called XXX and ||| edges) which are fun to find.
This one is an O-102, XXX edge which I attributed based on my Overton Book (third edition), but you can also look on line for help, coinzip.com has a great resource for attributing with lots of photos. The diagnostics for this one are the segments below the scroll on the reverse, which would make this either an O-102 or an O-110 (much rarer), but the obverse on the O-110 has a die break through star 4 ending in lumps, which this one does not have, therefore, it's an O-102!