First post to Reddit - Perhaps this isn't the best place to post this...I came across these at an Estate Sale. I am hoping someone can tell me more about them. http://imgur.com/a/6zZMN#j934jEl I realize the importance of the date, but would like to know more about their rarity and the creation of them. Are they important historical items or just someone's attempt to preserve the moment using the technology available at the time?