Antique Button Mystery - Is it a Butterfly or a Dragonfly?

One of the reasons I love antique buttons is that I often find tiny details that would often go unnoticed without looking closely. This particular button, circa 1890-1930, holds a small winged creature on its upper right surface. The question is, is this a butterfly or a dragonfly? 

I posed the question to my followers and “Dragonfly” received the majority of the votes, but only by a slight margin. So what do you think - butterfly or dragonfly? 

If you’d like to claim this lovely piece and start your own butterfly/dragonfly debate, you'll find this one-of-a-kind necklace flying around here!