What version Paradigm Studio 20's

How do I determine what version Paradigm Studio 20's I own?
Version one has has rectangular grill. Version 2 has a rounded top on the grill. Version three does as well. Version three is not available in real wood finish if that helps. How old are they?
it should say on the back on the speaker. the version 1 just says Studio 20, but the others say v.2 or v.3. you probably do not have v.3 unless you bought them recently.