Dave,
The ratio is just from my observations with the very few daggers I have seen. I have not handled enough to actual say this is a rule, just something I have observed so far. The ones I have seen, the distance of the width of the blade from the guard falls roughly around the letter "u" in Treue. There are exceptions as I said, I am just wondering if this is another one.

Being an engineer, I can't help but to see ratios everywhere.

Bob