London Fog ‘Maincoats’ coat with real fur collar and silk lining

This is an original London Fog coat, onto which someone seems to have loosely sewn a beautiful real fur collar (I believe it’s mink but I can’t be sure what animal it’s from). The collar is removable but also fastened in a sturdy way, conformed to the garment perfectly. No visible faults, a perfect vintage coat. Marked “10 petite” for size