The Apple Watch Leather Link was an Apple Watch band released in 2020. The design is similar to the previous Leather Loop design, but while the Leather Loop included a metal “eye” that looped back on itself, the Leather Link is secured solely by magnets.
Apple describes the Leather Link:
“The Leather Link features handcrafted Roux Granada leather made in France. The strap elegantly wraps around the wrist and magically attaches with flexible moulded magnets that gently flex to help maintain a secure, comfortable fit throughout the day.”
The Leather Link came in sizes including 41mm in S/M (130–160mm wrists) and M/L (140–180mm wrists), and 45mm in S/M (140–180mm wrists) and M/L (165–205mm wrists).
This example is Baltic Blue, a shade of dark blue with a hint of green, for the 44mm Apple Watch, and fit wrists in the M/L size range.
Presumably, this color is named for the color of the Baltic Sea, an part of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and North and Central Europe.