Pre-Prohibition lithographs are highly sought after today for all the same reasons as tin signs and chargers with one additional reason - they are difficult to find in excellent condition.  A metal sign has a better chance of surviving the decades due to its stout construction.  However, paper lithographs (especially calendars) were not created to withstand the ravages of time.  Consequently, if located today, many lithographs evidence fading, stains, rips, and other problems - all of which usually don't effect a tin sign to the same degree.

 

Below are a few examples of fine Lemp lithographs that have survived the trash can over 100 years ago and thankfully were well preserved through the years for our enjoyment today.