(Sigh) No-no-no-no-no! Although this button is shown in a photo in the Albert button-book, it is NOT "a good (real, original civil war) button." It is shown as a modernday reproduction. Mr. Albert politely called it an "unauthenticated Confederate" button, but it is absolutely a deliberate fake. Please read Mr. Albert's analysis of these buttons on page 363. Among other details, he says they were made in England in 1969.
In addition to the very weak detail of the emblem, the brass-wire loop is entirely incorrect for actual British-made Confederate Navy buttons. The correct loop looks like a perfectly-round car tire (with no hub in the middle) standing up on the ground. The fake's loop looks like (as in seen in poster Badchihuahua's photo) a long horseshoe with its two "legs" soldered into two separate holes in the ground.
Also, unlike on ALL of the original civil war Confederate Navy buttons, this fake's backmark is written in "plain block" lettering.
Counting the cuff version, Mr. Albert's book shows 5 versions of these fake Confederate Navy buttons. (CS-73a, CS-73b, CS-74a, CS74-b, CS-75.) Mr. Albert very helpfully included photos of the button backs, to help collectors recognize and avoid these deliberate fakes.
Badchihuahua, I see you are a brand-new member here at TreasureNet. Welcome to T-Net's "What Is It?" forum, the best place on the internet to get unknown objects CORRECTLY identified. (Please do not trust what Ebay sellers say, or even WorthPoint.)