What do we know about Omega "Rocket Line" pendulettes?

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Thanks Rudy, do you know the Concord calibre number and which other brands to look for?
 
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Coming slightly late to this thread - does anyone know of a source for the mainspring for the Montremo 42.EL.3 that's in most of these? I need a new one; it's very thin and very long, and I've not been able to find a replacement yet....