Vintage Coach Large Sidepack 9979 in British Tan Made in the United States

Rare vintage Coach sidepack shoulder or crossbody bag in British Tan, serial number A6C-9979 (made in the USA) The leather is supple and feels VERY good and fresh, but there is slight water or alcohol staining on front flap of bag as pictured, and pen marks in exterior flap pocket (the latter is not visible with normal wear). I cleaned and conditioned the bag but did not attempt to lift the stain - you may have better luck than me if you want to try a more invasive restoration method. As stated, exterior leather, interior suede, and brass are in remarkable condition otherwise. Approx 9.8" W x 11.0" H x 2.0" D