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I'm not sure what the difference is.  My Sirena was given to me by Sirena when they first came out.  Literally, the first week.  That's why my serial number is very low.  Haven't seen a new Sirena at a vac shop, so haven't had a chance to look at the serial numbers.  It's possible Sirena changed their numbering system when they came out with the Wessel-Werks power nozzle (which cleans like a dream).