Vintage Barbour Green Waxed Cotton Double-Breasted Trench Coat

Tag says the size is C40/102CM, but I'd say it fits like a US large. Vintage and well-loved, plenty of character in the fabric. It has a slightly musty smell--presumably the previous owner had it in storage for a long time--and unfortunately I can't machine-wash it without ruining the waxed finish. Perhaps re-waxing would cover up the scent? Only a couple areas of noteworthy damage (see pictures): one button is broken (easy enough to replace), the buckle for the waist belt is chipped (maybe replaceable?), and a small stain on one of the sleeves that looks like the previous owner waxed directly over it (not super noticeable unless you're looking for it).