In regard to the original post on the 'Rock in Waterfall" variety. I have been trying to play catch up on mounting all my 5 cents Beaver varieties and thought I would share a nice cover I have. It is a vertical pair with the top stamp showing the variety.
The Postmark on cover reads New-Liverpool, September 17, '67, L. C. This is a State 9 printing. The pair is positions 53 (Rock in Falls variety), and Position 63 has a very minor printing flaw which is a small dot above the right flower in the inner oval.