There is no set colors for years on stereoviews. Many of the earliest ones are on larger cabinet backs and have orange and yellow mounts, these are generally from the 1870's. The earlier ones are actually smaller and have rectangular photo portions, you can find those with valuable Civil War scenes etc. In reality, the Civil War is what really made these popular as they were a novelty until war-scenes became the cool thing to have around the house to show your friends. In general, stereoviews were not widely distributed or used until the 1870's and are rare before then with exception of mass-produced civil war images etc.
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