Dating A Kropp Razor

Just out of curiosity, is there any information with regards to Kropp serial numbers? I have a 6/8 Kropp that came in what is presumably the original box, and stamped on the box is the number "513529". Is it a serial number, some kind of QA number or something else entirely?
 
I have a set of Kropp razors. It would appear they are from the earliest set. Attached pics. Unfortunately the box is quite damaged
 

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