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I like these concepts! It does seem that there isn't a middle ground though. Concepts 1 & 2 immediately scream "modern", while 3 & 4 shout "classic". My thoughts were to try using the font from the second concept, with the STYLE of the lock in the 3rd concept.
On a side note, I really like the look of the lock in the first 2 concepts. Very original!
