On my Genesis 2, the serial number appears in two locations:
1) Remove the wooden work surface on the RIGHT side, there's an oval-shaped sticker on the frame.
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2) Remove the burner control knobs. I believe there are plastic clips in the right edge of the control panel that pop out and the panel lifts right out. There's a large sticker on the bottom of the panel.
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If it's L3 xxxxxx it's a Genesis 2. If it's KL3 xxxxxx it's a first-year (1993) Genesis 2000. If it's EH xxxxxx or another two-letter code, it's a 1994 or later Genesis 2000 and can be dated using the table here: How To Determine The Age Of Weber Grills & Smokers
Thanks, have a new project and the frame label is long erased! Will look under the control panel.