Okay, Laaz, here are some photos of my mystery lemon tree (that's Deadline squirted on the bottom of the trunk and base of the tree due the March of the Snails at my house):
Interesting almost serrated leaves:
Definitely a lemon and not a citron, as flowers are purplish as is new growth and tiny new lemon fruits:
And an example of a lemon. This is one of the smaller ones:
They are seedless or nearly so, and the skin is a little bit thicker than a Eureka.