Price and age of the M6 I just bought?

[kelpike]

I just came across an M6 and was able to get it for $250. It was owned by an elderly woman who passed away so her grandson listed it on CL. Is this a good deal for the M6? The serial number is 9063-xxxx-xxx. Also on the sticker is a picture of a barrel with an X through it and the date 2009. Is it true the first four numbers of the serial number are the date code? Did I just score a pretty good deal on a fairly new detector? (new to me cause I'm switching from an older Surfmaster II Plus) I can only assume I'll see a big difference in these two machines.