Sorry, I don't have any information for you, but I wanted to say it's gorgeous! Lucky you!

You probably already know that the bird is a Red-Crowned Crane (Grus japonensis -- Japanese Crane), but name aside, the larger group of these birds are migratory, ranging from eastern Siberia into China and Korea, with only a non-migratory population residing in Japan. Consequently, the bird is found in artworks from all three countries.

In general, the red-crowned crane symbolizes longevity. Each of the cultures adds their own spin to that: immortality in China, strength and loyality in Japan, purity in Korea. So although the characters displayed on your piece are Chinese (I'm sorry, but I can't tell what they say) the piece itself might have been made in any of the three countries.

Although the needlework appears to be very good, the degree of complexity in the design itself, both in the border frame (very much in the Chinese style) and in the body of the work, leads me to believe that the tapestry itself is unlikely to be very much older than the fifty years that it spent with its previous owner. Composition in antique and even vintage Chinese pieces tends to be much more involved, visually dense. The openness of this composition leads me to suspect it's more likely Japanese, at least in its style. I can't add much about Korean tapestry because I simply don't know anything about it, or even how much of it exists. About all I can say is that I'm reasonably certain those are not Korean characters trying to tell us something.

So my suggestion is that it's most likely Japanese, 20th century, perhaps Taisho period (1912-26) when Japanese artists began to be more influenced by western art and design, but more likely late Shōwa (post-WW2) when the Japanese economy exploded with goods sent to and designed specifically for Western tastes.