I don't collect RPMs, but I own tons of them . Here's the link to Coneca . http://varietyvista.com/02b LC RPMs Vol 2/1971SRPM001.htm
He is right the 7 is much further from the mint mark. You just got to drawl a line on the picture off your computer/phone on a piece of paper. I drew a line from the bottom right (your right) serif of the 7 to the top serif of the S. at least that's where I see it wide
Not to mention the different direction of die scratches/abrasions. VV's are NE/SW. Rick's are NW/SE. However, those die scratches don't prove much. They sometimes change dramatically. The placement doesn't.