Quick answer
On a Constance 24 in Swift, three details settle most comparisons: the blind stamp, the stitch angle, and the weight of the H clasp. Real Swift leather has a fine, close grain, a soft hand, and a low sheen. Replicas tend to feel slick, look glossy, and carry machine stitching that sits flat on the surface instead of slanting. Check those three items first, then work through the bag in a fixed order so you do not talk yourself into a wrong call on a single detail.
What you need
- Bright, indirect light and a bare table
- A 10x jeweler's loupe
- A soft tape measure
- A small kitchen scale for hardware weight
- A phone for close-up photos of the stamp and stitching
Step-by-step comparison
- Find the blind stamp. Open the flap and look inside the back wall. A real Constance 24 carries a heat stamp pressed into the leather with no ink, foil, or color. The letters sit at an even depth with crisp edges. A fake reads shallow in one letter and deep in the next, or shows gold foil that flakes at the edge.
- Study the Swift surface. Tilt the bag toward the light. Swift has a fine grain that almost disappears at arm's length, with a matte-to-satin finish and a spongy press under your thumb. Fake leather in this style shows an embossed pattern that repeats with mechanical regularity, or a plastic coating that reflects light in hard patches.
- Count the stitches. Measure one inch along the flap edge and count. Hermès saddle stitching runs about eight to nine stitches per inch, sewn by hand with two needles, so each stitch sits at a slight angle and the thread has a visible twist. Machine lockstitch looks flat, uniform, and aligned straight down the seam.
- Weigh the H clasp. Detach the strap and hold the buckle. The genuine H is solid brass with palladium or gold plating, so it has real heft for its size. Place it on the scale and compare with a known piece if you have one. Replicas use thin cast metal or plated zinc that feels light and rings hollow when tapped.
- Inspect the enamel fill. Run a fingernail across the enamel inside the H. Genuine enamel sits flush with the metal frame and shows no bubbles or pits. Fakes leave the enamel proud of the frame, with a visible lip you can catch a nail on.
- Check the edge paint. Look at the side seam where the front and back panels meet. Real edge paint is thin, even, and slightly matte, with no drips onto the leather face. A fake shows thick paint, a wavy line, or a hard plastic edge that peels at the corner.
- Measure the body. Lay the bag flat and measure across the base, then up the side. A Constance 24 runs about 24 cm wide, 18 cm high, and 7 cm deep. A fake built on a generic pattern lands a centimeter or more off in one direction, most often too deep.
- Read the interior. Check the slip pocket, the lining material, and the interior stamp. Genuine interiors use the same care as the outside, with tight stitching on the pocket and a clean stamp on the back wall. Fakes cut corners inside where buyers look last.
- Compare the date stamp. Find the small letter inside a shape pressed into the interior leather. The shape and letter follow Hermès coding. A fake often uses a random letter with no shape, or a shape that does not match the stated production year.
- Finish with the packaging. Look at the dust bag fabric, the box print, and the rain cover. These items are easy to copy and easy to get wrong at the same time, so treat them as a tiebreaker and never as proof on their own.
Numbers to keep on hand
- Body: about 24 cm wide, 18 cm high, 7 cm deep
- Stitch density: 8 to 9 stitches per inch
- Strap: single leather strap, adjustable, with the H clasp at the front flap
- Hardware: solid brass base, palladium or gold plated
How to weigh the evidence
A single flaw proves nothing. Stamps wear, leather softens, and hardware ages. Treat the comparison as a scorecard: a fake fails three or more of the ten checks above, while a genuine bag passes the stamp, stitch, and hardware tests even when it shows wear. If you cannot inspect the bag in person, ask for close-up photos of the blind stamp, one inch of flap stitching, and the back of the H clasp before you decide.