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davidcyclebackMost 1860s CDVs had square corners, while later usually had rounded corners. It can be hard to determine if the card has wear or is clipped. The double line in blue or red was a common styke to 1860s CDVs, though you can find examples with one line or no lines.
The example on eBay is clearly from the 1860s, down to the guy wearing long pants instead of knickers.