Felix Riedel Riedl Drawing Painting Ink Watercolor Framed 1880's City Scene

I purchased this lovely piece at an estate sale. The artist was born in the later 1800's.  I'm guessing that this was created in 1940 because of the "40" after the name.    It is a framed drawing by Felix Riedel.  I do not know much about it. Everything I find on this artist is all in high end auction houses that want you to pay a fee to see prices.  I am hoping that means it has some value.   I don't believe it is a print (although I am not for sure.) I have looked at it under a 30x's magnifying glass and see no pixelation whatsoever.  The frame is approximately 19x15 and the drawing itself is approximately 10x14. The photos may show some reflection due to the glass.  I would like to know what the likelyhood this  is real, versus a print and if it was an original, what it's approximate value would be. Thanks so much!