Short Answer
Fake 5105 features are the visible and measurable tells on a replica of the reference 5105: case geometry and polish, dial printing and marker setting, hand stack and lume, crown engraving, caseback text, movement finishing, and the paperwork that travels with the watch. The 5105 is a dress watch reference, so the tells sit in small details, not in loud graphics. A fake usually shows softer case edges, thicker dial text, a flatter hand set, and a caseback engraving that lacks depth. Inspect one watch at a time and record what you see before you decide.
Prerequisites
- 10x loupe
- Soft cloth and lint-free gloves
- Digital caliper
- Neutral light source with no direct glare
- Camera for records
Inspection Procedure
- Place the watch on a soft cloth under neutral light and set a 10x loupe within reach.
- Measure case diameter, thickness, and lug width with a digital caliper and write down each number.
- Trace the case profile with your fingertip and check for sharp edges, flat flanks, or uneven bevels.
- Inspect the bezel and lugs at 10x for polish direction and for gaps between case parts.
- Examine the dial print: look at letter height, spacing, and ink edges, not just the text content.
- Check each applied marker for alignment, height, and polish at the base.
- Look at the hand stack from the side: hour, minute, and second hands should sit at consistent heights.
- Test the lume with a short charge and compare brightness and decay across all markers.
- Inspect the date window if present: font, centering, and the gap between the aperture and the dial print.
- Turn the crown and check engraving depth, stem length, and winding feel.
- Remove the caseback only if you have the correct tool, then inspect rotor engraving, bridges, and screws.
- Read the caseback text at an angle: depth, font, and spacing are more useful than the words alone.
- Compare the serial and reference numbers with the paperwork and photograph each number.
- Record all findings in a simple table before you make a buy or return decision.
Red Flags to Record
- Dial print that sits high above the surface or shows feathered ink edges
- Hands that touch each other or sit at uneven heights
- Caseback engraving that looks laser-etched and shallow
- Movement finishing with tool marks, wrong screw heads, or rough anglage
- Paperwork with mismatched fonts, spacing, or reference numbers
What the Tells Mean
A single red flag does not prove the watch is fake. Two or three flags in the same area, such as dial print, hand stack, and caseback depth, form a pattern. Photograph each finding and compare it with official reference images and measured dimensions. If the seller cannot explain a mismatch, treat that as a data point, not as proof. The goal is a record you can compare across watches, not a guess made in one glance.