Quote:
Originally Posted by sa230e
This is the date stamp in grayscale with the contrast pumped way up.

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Yeah, I can see the six, but it doesn't match the rest of the font, and I think its just an illusion from the image. The number 8 at the end of the stamp is the only digit that is really clear. A date of 1998 would be too late as the 407 was finished, and 1978 or anything before it wouldn't make sense as the 407 hadn't even been designed by then. It may look like 1968, but that date doesn't make sense.
edit:
Including a photo of a date stamp with spalled concrete. This bridge was completed in 1983, but because of how the date stamp has aged, it looks as though it could date from 1988. Just posting for interests stake: