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Railmaster Cal2403 vs AquaTerra Cal2500

I am deciding between the Railmaster and Aqua Terra for my next Omega. I had thought the only differences were dial design and lack of date on the Railmaster, but in fact the calibers are quite different as well.

Railmaster Cal2403 is described on the Omega site as having "free-sprung balance without index" and I wonder, what does this mean? What is a free-sprung balance and why is it superior (if it is)?

Is there any visible difference between the Railmaster and Aqua Terra calibres through their display casebacks?

Thanks for any info,
GT

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Railmaster Cal2403 vs AquaTerra Cal2500

Re: Railmaster Cal2403 vs AquaTerra Cal2500

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0 wallclock secs ( 0.18 usr + 0.02 sys = 0.20 CPU)