Figuring out year

I purchased a 640 with a serial# of 131041
My question is that when I look up the number under 640 the list ends @ 116368.
Is there something I'm missing or is there another way to figure it out what year I have - thanks

Follow Ups:

• Re: Figuring out year - Timmy LaPree 11:14:24 08/08/23 (3)
  • Re: Figuring out year (url) - Ed Gooding (VA) 06:00:28 08/09/23 (0)
  • Re: Figuring out year - mhb@ufe 15:44:25 08/08/23 (1)
    • Re: Figuring out year - Tim 06:36:10 08/09/23 (0)

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