The time periods vary, but all stand in sharp contrast to today's mass-produced, efficient, uncaring storefronts. They all share a history of owners, founders, and entreprenuers who chose to enhance their environment rather than intrude upon it, even if it meant a few less dollars in the till.
(Of course, it simply could be that in previous eras, the technology to make cheap, mass produced signs was not available, so businessmen had no choice but to pay for a fancy, handmade sign. But, I prefer to think it was the former that created the signage we see so little of today.)
Unfortunately, today's business model doesn't leave much room for historical preservation, and I've yet to see anyone protesting their destruction, so I felt the need to preserve them for future generations, as images, if not as real artifacts.