BELLONI WATCH CROWNS - SCREW DOWN CROWNS WITH INTERNAL THREADS. BELLONI is the ONLY Italian Hi-Quality Watch Crowns manufacturer since 1946.The Best Quality: Our quality people check and test every single crown after manufacturing.  The Best For-Diving Technology.
• Perfect seal with up to 20 atmospheres of pressure on screw on crowns for diving watches.
• VITON ANTI-ACID flat gaskets to ensure the perfect seal for the longest time.
• NITRILIC O-RING inside the Tubes, to guarantee a good seal even if the Crown is accidentally
unscrewed.
• ROSLEAU EXTRA ARMONIC INOX spring, to guarantee a charge up to 1.5 Kg.