Long time collector, but I still don't know how VAM works, please help :)

I found this: http://www.bestcoin.com/Top-100-Morgan-Dollar-Varieties.htm
It explains what to look for nicely. (If you have a better site let me know!)
However, what really confuses me is:
1880-O | Overdate | VAM 4, 5 | "Crossbar" varieties. Both have similar variety feature. VAM 4 has Micro O & VAM 5 has Oval O mintmark. VAM 5 is scarcer.
1879-O | RPM | VAM 4, 28 | "O/Horizontal O" Mintmark. VAM 28 is a new discovery, which has a different Obverse with this same Reverse.
How can BOTH of these be VAM4?
Is there a better site?
Should I shell out the $24.95 for this book "The Top 100 Morgan Dollar Varieties: The VAM Keys"
Or is there a better book?
I'm really interested in learning about the VAMs. Mainly because I like my Morgans and I want to start toying with VAM collecting as well since I'm nearing completion on my "basic set".
Thanks for all the help in advance!
It explains what to look for nicely. (If you have a better site let me know!)
However, what really confuses me is:
1880-O | Overdate | VAM 4, 5 | "Crossbar" varieties. Both have similar variety feature. VAM 4 has Micro O & VAM 5 has Oval O mintmark. VAM 5 is scarcer.
1879-O | RPM | VAM 4, 28 | "O/Horizontal O" Mintmark. VAM 28 is a new discovery, which has a different Obverse with this same Reverse.
How can BOTH of these be VAM4?
Is there a better site?
Should I shell out the $24.95 for this book "The Top 100 Morgan Dollar Varieties: The VAM Keys"
Or is there a better book?
I'm really interested in learning about the VAMs. Mainly because I like my Morgans and I want to start toying with VAM collecting as well since I'm nearing completion on my "basic set".
Thanks for all the help in advance!
0
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Top 100 Morgan dollars with Photos
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You wouldn't believe how long it took to get him to sit still for this.
take baby steps
"La Vostra Nonna Ha Faccia Del Fungo"
Of course you guys realize you've just cost me thousands of dollars