Vintage Monogram Vintage Underarm Bag. This vintage monogram piece is truly a treasure. Regardless of the size of the bag or the length of the strap, carrying it under the arm is always stylish. It's a timeless classic that never goes out of fashion. The minimalist design combined with the iconic monogram allows for a look that can be sweet, cool, or casual! Dimensions: 29x25x4 cm. Model number: 8320 White Steel.