I don't understand why this is a deal breaker , is there a visible thing that you can see
Apparently There are two speeds available for the 6497/6498. The 6497-1 and 6498-1 are 18,000 bph. The 6497-2 and 6498-2 are 21,600 bph Although, technically, anything 18,000 bph or faster is considered "high beat."
These are 18 http://www.ofrei.com/page_183.html
And so are these
http://calibercorner.com/tag/6497-1/
I reckon you need to go Gen