The Seiko 0843-5010 I received a part of a job lot is an interesting watch.

The snowflake (?) texture was probably added by another watchmaker after the watch was bought.

Edit (2024-11-11): I did see an 0842-5010 having the same finishing on online auction, yet searching for images of 0843-5010 all showed a flat surface instead of the textured one—does that mean this is a frankenwatch made of 0842-5010 case and 0843-5010 innard?

At the time I thought the brown part was rust but later realized those are glue residues. By soaking the parts in solvant they can easily be cleaned up.

The problem was with the crystal.

While I have the chipped off part and had the option to glue them all back together, I thought that'd create structual abnormality and weak point that'll simply snap again when I push the crystal back on.

What I saw people do is to create one from acrylic plate.

Luckily the bezel of this one isn't too hard to measure.

And with the original glass for comparision, it's possible to take a acrylic plate, to cut and sand into shape. With my limited ability in hand-sanding, the edges are rather off even though the plastic itself fits onto the bezel fine.

This is original.

This is mine.

Time to bring out the big gun. It's quite cheap to get laser-cut acrylic on Taobao. I just had to measure the dimensions and get it more or less correct.

The slide caliper I used is only accurate to 0.1mm, so my measurement may be off by 0.1~0.2 mm. In the dxf file I created via LibreCAD I added 14 versions with slightly different dimensions.

If you want to create your own, you can use the dxf that I created crystal.zip.

Compared to the original, this is still a bit soft, and is missing the slanted edge.

Good thing is it fits. I may need to actually glue the acrylic onto the bezel to improve the water/dust seal.