Jay-Images used on CdVs can also be from an earlier time. I'm sure there are CdVs with images taken earlier than the mount would suggest. Photographers retained negatives for future demand. Possibly, the earliest CdVs created with the negative are lost to the ages. Thus, the CdV may be identified to a date range by the mount, which gives us the approximate year of issue, but the actual image is from an earlier period than assumed. I'm not talking decades here, but a few years is significant both historically and with regard to value.
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