Does anyone have an explanation or understand the numbers stamped in the bottom of wrinkle tanks?
I have attached 3 pictures of the numbers stamped on the bottom of the rear tank mount bracket.

#4.718 - Tank on original frame #4623
#4.821 - Extra wrinkle tank that I have
#4.828 - This was stamped on the tank that recently sold on eBay for $800  - No I didn't buy it!

Should the VIN & Tank number be "close" like the Engine/Frame #s?
Can you guys that have wrinkle tanks and see if they are stamped?
When did HONDA start stamping wrinkle tanks?

Thanks,
Andy