First of all....run, don't walk....before you get hooked on silverware!
Cute little piece!!!
First glance (without knowing size and maker) I would say that you have a dessert or pastry fork. This style is reminiscent of the 4" to 5" pastry forks that are common in English flatware.
Typically a formal fish fork is over 5 1/2" and up to 7 1/2" in length, has 4 tines and doesn't need a strengthened tine because you would have a fish knife! The fish forks that you do see with a widened tine have a notch/groove on the end so that you can hold on to the bones.
Pelady, silverplate pie forks only. Over the years I have picked up minimum of 4 matching to 12 matching pieces at a time - in order to try and make 6 piece or 12 piece place settings. I have a few 12 piece sets of sterling as well (Most purchased for asking prices that were a good investment such as $60 for 12 and could easily sell for the forks at $100+ EACH.)