The card is signed by the artist just below the image while the words "Seasons Greetings" are in the lower LH corner. It is not matted or framed. The reverse has no writing on it but it does have a depression where the image was printed on the front. The illustration is of old cannons firing with WW1 planes overhead. The buildings remind me of London, England.
I believe it was produced during WW1 or shortly after. There is an inscription in the image. The card is in typical overall condition for a document being at least 100 years old.
The top and bottom edges are a little rough edged while the RH and bottom are crisp. If you can enlighten me any more than I found out please let me know. The item "Early 1900's Christmas card by Owen Staples RARE with FREE SHIPPING" is in sale since Friday, February 22, 2019. This item is in the category "Collectibles\Paper\Vintage Greeting Cards\Christmas".
The seller is "carlitguy" and is located in Red Deer, Alberta. This item can be shipped to Canada, all countries in Europe, all countries in continental Asia, United States, Australia, Mexico.