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I think the emblem part of the design is fantastic. Incorporating the S & Co is great. I think you could tweak it a little more to make it look like a lock. If I didn't read the background info, it would have taken me a little longer to figure out what it was. I would play with the copy font a little more. I like the first one the best because the increased x-height coinsides with the height of the emblem. I would get rid of the crossed "m" though. It registers as an upside down cross.. Overall, the first is my favorite. But maybe with a different font. : )
