This handmade advertising postcard was mailed in December 1938 to an address in York, Pennsylvania
Leinhardt Bros. was a furniture store in York. It was known as “The Friendly Store." It was located on the 200 block of West Market Street. Most of the old advertising and references I've found online are from the 1940s through 1960s.
And we know the business was still around in 1972, because it is prominently featured in a photograph showing the devastation from Hurricane Agnes in York. That photo can be seen in a 2009 post on Jim McClure's York Town Square blog.
So, we know Leinhardt Bros. spanned at least the 1930s through 1970s. I'd happily welcome any reader memories or historical information in the comments section.