I'm thinking Waverly Strap Buttons for this one . Which color ?? (w/chrome screw) , White , Dark Tortoise , or Snakewood ?
https://www.stewmac.com/parts-and-hardware/strap-buttons/waverly-guitar-strap-button/
https://www.stewmac.com/parts-and-hardware/strap-buttons/waverly-guitar-strap-button/