I post the "crystals" as soon as I can using royal mail 2nd class, please contact me if you have any issue before you leave a negative feedback. Having a happy customer leaving positive feedback is far more important than earning a little amount of money. In the current circumstances Royal Mail is struggling with delivery, we have recent examples of almost 2 weeks delay, not received at all and a broken crystal as well. Once it is lost there is no point to contact Royal Mail as they cannot track 2nd class letters. If you don't receive it I simply send you another one, or I offer a refund, up to you.
One of my customer asked for dimensions of a 316 crystal end here are the results:
316 shows up as 31.52 mm , inner diameter shows up as 29.51 mm, it gives us approximately 1 mm wall thickness, I measured it as 0.96 mm separately. We have the math more or less. I measured the whole height which is somewhere between 4.25 and 4.35 mm. It was difficult to measure it as the diameter of the crystal is wider than the flat section of my caliper jaws so I had to use a plastic card, measured the plastic card and the crystal together and measured the plastic card only, then made the deduction.
I am generally interested in watches and clocks and anything related to watches and clocks. I have not got the time yet, but I am going to compare high domed 292 crystals, DPA, Sternkreuz HH and any of the older not in production anymore crystals i can put my hands on.
Any other questions please feel free to ask.
Update on 17th of September 2020:
Added two more pictures where I compared 4 crystals together. An original crystal coming from a case hiding a CAL400 movement from Services, a DPA, a sternkreuz HW and a sternkreuz HH, you can see them in this order on the pictures from the left to the right. I used a cheap but relatively accurate digital caliper to measure the height and diameter of them.
Diameter Height
Original Services 29.1 mm 4.4 mm
DPA 29.11 mm 3.75 mm
sternkreuz HW 29.3 mm 4.0 mm
sternkreuz HH 29.25 mm 4.7 mm
Unfortunately I cannot measure the inner height but the official data is 2.7 mm for sternkreuz HW and 3.7 mm for sternkreuz HH. Expect that it will be less for the DPA.
Update 19.02.2021
The manufacturer claims that every crystal is smaller by 0.05mm than the size written on the box by design. So a 29.2 mm watch is supposed to be 29.15 mm +/- 0.02 mm. However when I measured some of the crystals picked up randomly I measured a wider range of spread. Generally speaking they are even smaller than the designed diameter. I measured crystals from the range 29.0 - 32.2, picked one random crystal from a box containing 10 crystals (I had 8, 9 or 10 boxes) and the result is the following:
|
pack1 |
pack2 |
pack3 |
pack4 |
pack5 |
pack6 |
pack7 |
pack8 |
pack9 |
pack10 |
| 29.00 |
28.95 |
28.91 |
28.93 |
28.92 |
28.92 |
28.94 |
28.93 |
28.93 |
28.92 |
28.94 |
| 29.20 |
29.12 |
29.12 |
29.12 |
29.12 |
29.13 |
29.12 |
29.12 |
29.12 |
29.10 |
29.12 |
| 29.40 |
29.32 |
29.38 |
29.32 |
29.30 |
29.32 |
29.32 |
29.30 |
29.30 |
29.29 |
29.30 |
| 29.60 |
29.48 |
29.51 |
29.47 |
29.49 |
29.48 |
29.48 |
29.48 |
29.49 |
29.49 |
|
| 29.80 |
29.72 |
29.70 |
29.70 |
29.71 |
29.71 |
29.70 |
29.70 |
29.70 |
29.71 |
29.70 |
| 30.00 |
29.91 |
29.89 |
29.91 |
29.91 |
29.92 |
29.91 |
29.90 |
29.91 |
29.94 |
|
| 30.20 |
30.13 |
30.11 |
30.13 |
30.13 |
30.12 |
30.12 |
30.11 |
30.11 |
30.12 |
|
| 30.40 |
30.33 |
30.32 |
30.33 |
30.35 |
30.34 |
30.32 |
30.33 |
30.33 |
30.33 |
|
| 30.60 |
30.49 |
30.48 |
30.47 |
30.48 |
30.47 |
30.48 |
30.48 |
30.49 |
30.53 |
30.51 |
| 30.80 |
30.68 |
30.67 |
30.66 |
30.71 |
30.70 |
30.70 |
30.67 |
30.68 |
30.71 |
30.72 |
| 31.00 |
30.93 |
30.93 |
30.93 |
30.92 |
30.92 |
30.92 |
30.92 |
30.92 |
30.93 |
|
| 31.20 |
31.12 |
31.11 |
31.09 |
31.10 |
31.10 |
31.11 |
31.11 |
31.13 |
|
|
| 31.40 |
31.31 |
31.35 |
31.33 |
31.32 |
31.31 |
31.28 |
31.33 |
31.34 |
31.39 |
31.31 |
| 31.60 |
31.52 |
31.49 |
31.49 |
31.50 |
31.52 |
31.50 |
31.49 |
31.49 |
31.52 |
31.50 |
| 31.80 |
31.74 |
31.71 |
31.72 |
31.74 |
31.72 |
31.73 |
31.68 |
31.74 |
31.71 |
31.71 |
| 32.00 |
31.95 |
31.99 |
31.95 |
31.99 |
31.97 |
32.00 |
31.97 |
31.99 |
31.97 |
31.98 |
| 32.20 |
32.14 |
32.12 |
32.12 |
32.14 |
32.14 |
32.14 |
32.11 |
32.17 |
32.10 |
|
I have listed new old stock watch crystals. I also have new old stock crystals still waiting to be listed. I am going to list them as time allows. Check my other listings time to time.