What type of crystal do I need? Ever-tite? Diver-tite?

[MikeRaleighNC]

I have a LeGant diver with a Seiko 66-based movement. Came to me without a crystal. It appears that the chapter ring must be a tension ring because I'm not sure how else a crystal will fit. Any ideas about what type of GS plastic crystal I need? Thanks in advance.

[rogart63]

Hard to say. You probably have to test which fits the best . You could test with a Sternkruez ATC or ATCT also. What diameter does it have. 

[MikeRaleighNC]

1 hour ago, rogart63 said:

Hard to say. You probably have to test which fits the best . You could test with a Sternkruez ATC or ATCT also. What diameter does it have. 

Thanks for the reply. It's 29.95 inner diameter. I test fit a regular GS PHD and it fit (30.0mm) which fit on its own; however, with it's taper (cylinder walls of crystal are not vertical), the chapter ring would not fit. I own a Cordura Seagull that uses the chapter ring as a tension ring, but it's unclear what type of crystal that is, either. 

[FLwatchguy73]

I have a Sicura Satellite with the same chapter ring feature. I ended up gluing mine into the crystal shoulder where the tension ring originally went because the crystal I acquired was exactly the same size as the opening, it probably should have been a millimeter or so bigger. Does this watch have a separate crown that moves the chapter ring? If not then I believe the chapter ring is the tension ring.

[MikeRaleighNC]

7 minutes ago, FLwatchguy73 said:

I have a Sicura Satellite with the same chapter ring feature. I ended up gluing mine into the crystal shoulder where the tension ring originally went because the crystal I acquired was exactly the same size as the opening, it probably should have been a millimeter or so bigger. Does this watch have a separate crown that moves the chapter ring? If not then I believe the chapter ring is the tension ring.

Crown does not rotate chapter ring. Based on the dimensions and the fact that the chapter ring sits on top of the shoulder (not below directly on the dial), I too am convinced its a tension ring situation. However, still not exactly sure what crystal that relates to. I order a ever-tite and ill try to snap out the tension ring and insert the chapter ring. If not that, perhaps a diver-tite or some other specialty PA crystal? Thanks for the input.

[FLwatchguy73]

I purchased an Ever-Tite and the tension ring slid out easily. The chapter ring fit perfectly, if not a tiny bit more lose, that's why I had to glue mine in.

[yankeedog]

Makes you  wonder . I would look at that and think every  crystal would be a never right. I would go by the case ID.and as mentioned  retainer  rings pop right out.

[rogart63]

Can have a check if i find a 30 mm crystal  with crystal ring  tomorrow . And the what the  inside diameter is. Also have some diver and evertite crystals . But not in 30 mm . But can see how high it is  So the chapter ring fits. 

[rogart63]

Had a Divertite . The crystal is very thick . Inside diameter without chromed ring is about 1,6 mm smaller then outside. This is 29,7 so inside is 28,1 mm  Then had some others that are about 1mm smaller inside. So a 30 mm is 29 mm . 1 mm high chromed ring. A divertite is about the same inside as a evertite. But has much thicker acrylic on top . 

[MikeRaleighNC]

This is incredibly helpful! Thank you! I ordered a ET, but it sounds like the DT will work too (a look more rugged). Esslinger is closed, but casker is processing weekly... Thanks again!

7 minutes ago, rogart63 said:

Had a Divertite . The crystal is very thick . Inside diameter without chromed ring is about 1,6 mm smaller then outside. This is 29,7 so inside is 28,1 mm  Then had some others that are about 1mm smaller inside. So a 30 mm is 29 mm . 1 mm high chromed ring. A divertite is about the same inside as a evertite. But has much thicker acrylic on top . 

 

[rogart63]

2 hours ago, MikeRaleighNC said:

This is incredibly helpful! Thank you! I ordered a ET, but it sounds like the DT will work too (a look more rugged). Esslinger is closed, but casker is processing weekly... Thanks again!

 

Evertite crystal are very nice . Have used them on some Chronographs with same kind of chapter ring. They are hard to find  here in Europe. And think they are of better quality  then Sternkreuz

If you are in USA check tiptopcrystals out. They could be opened? https://www.tiptopcrystals.com/

Edited April 1, 2020 by rogart63

[MikeRaleighNC]

A success! I got the evertite crystal in, and the chapter ring nest perfectly. Here it is at the end of the day, cleaned, serviced, and reassembled. Thanks for everyone's help!

Could benefit from a fun tropic strap or nato (but don't have one on hand). Ended up messing up one of the lumed markets when soldering a dial foot, so ended up rubbing all of them off for a balanced, clean look. Will re-lume in the future once I get my hands on a kit