Crystal Press Back Symbol — What This Mark Means
A small symbol on the case back indicating it should be opened with a crystal press tool rather than unscrewed. This marking guides watchmakers on the correct method for case back removal.
What This Usually Means
This symbol tells you (or your watchmaker) that the case back is a snap-on or press-fit type, requiring a specific case press tool to open and close. Attempting to pry it open with improper tools can damage the case, gasket, or crystal. Snap-on backs are common on watches with lower water resistance ratings.
Where to Find It
Usually found as a small icon or notch pattern on the outer edge of the case back. It often appears as a small arrow, a lip/notch for a case knife, or a series of indentations around the perimeter.
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Common Variations
Some case backs feature a small lip or groove for a case knife, while others have notch patterns for a specific opener. Screw-down case backs have visible slots or notches in a regular pattern. Press-fit backs are typically smooth with minimal markings.
Common Misconceptions
People sometimes assume all case backs unscrew, but press-fit and snap-on backs are very common on mid-range and entry-level watches. Forcing a press-fit back with a screw tool can cause serious damage.
What to Do Next
If you need to open the case back for a battery change or inspection, identify the type first. Press-fit backs require a case press or case knife. For battery changes, consider visiting a professional to avoid damaging gaskets or the movement.
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Related Markings
A marking indicating the watch's tested water resistance depth, typically shown in meters, feet, bar, or ATM. This ratin
Stainless Steel Back StampA marking reading "STAINLESS STEEL BACK" or "ST. STEEL BACK" indicating the case back material. This is commonly found o
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Frequently asked questions
What does the crystal press symbol look like?
It varies but often appears as a small lip, notch, arrow, or series of indentations on the case back edge indicating a snap-on design.
Can I open a press-fit case back myself?
It's possible with the right tools, but improper technique can damage the case or gasket. Professional service is recommended.
How do I tell if my case back screws off or presses on?
Screw-down backs have evenly spaced notches or slots around the edge. Press-fit backs are typically smooth or have a single small lip.
Will opening the case back void my warranty?
Often yes. Most manufacturers require authorized service centers to open the case to maintain warranty coverage.
Does a press-fit back mean lower water resistance?
Generally, press-fit backs offer less water resistance than screw-down backs, but many still achieve adequate ratings for everyday use.
What tools do I need to open a press-fit back?
A case knife or case back opener tool for removal, and a crystal press for reinstallation. Specialized tools help prevent damage.