Most newcommers seem to be using the Craig Riesch book. For those of us just starting, or getting back into collecting, it would be of immense help to have the "pros" point out the errors in this book relating to parts markings so we can make the corrections.

For instance, Rock-Ola type three hammer markings, the book shows nine possible markings for this hammer, is the book right or wrong?

What else is "known" and needs to be corrected in the book?
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