That is as good as it gets...in the water a long time. Looks like a Knight with sword and shield inside of a arrowhead shape or crest. The picture looks better than the pin looks in person.
After a little research...this is a religious pin: A Standing Knight is the symbol for the "Armor of God" the Lotus flower on the left is the symbol for creation/birth or rebirth and the Y with the circle above is the symbol for the Holy Euchorist. I can't find one like it to compare or get the age...but I think its cool!