Quote:
Originally Posted by Jeffrompa
The backs will indicate what system was used to make it such as " AZO " , " CYKO " , and " VELOX " as well as many others .
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That's the type of reference I'm looking for - an explanation of the various backs. Not just for RPPC's, but for everything. Also for the non-USA postcards - I have some from Canada, Japan, etc. It would even be helpful to have info on postage and cancellation marks used during different periods. Just all of it wrapped up in one useful guide. Does such a thing exist?