It is definitely a Golfer's sports-jacket button, from the early-1900s (and later), if I recall correctly. At the moment, I can't recall the name of the specific Golfing Club it represents. If I can think of it, or find the ID-photo somewhere in my computer's files, I'll post it.
Edit: When I clicked on "Post" after typing the reply, I see that BigCypressHunter has already found the specific Golfing Club's ID. Thanks for saving me the search-labor, BCH.