There are at least 4 type of crystal for mark II. In my experience almost all the mark II that have been overhauled in the past have a service crystal.
Here for examples two versions that can be distinguished by the 85.

 

Haha yes I actually do have one extra laying around - PM me.

 

For the picture I believe it is a Holzer bracelet. Omega had these in the Latin American markets. I had a couple of pieces from Mexico that had them. They came in 20 and 22 millimeters.

 

I'll do that now thanks

 

Picked up a mark ii racing in ok-ish shape for $1300 and then sold for $1800 in 6 months. Was quite proud of myself, but now I realize I got really lucky. No bracelet on either transaction

 

Does this look like a service or aftermarket crystal for the mark ii 145.014

 

Interesting- so if you were to add bracelet cos (around 200 USD if looking for a vintage version) you’re looking at $2000 for your racing

Interesting - when was this? You'd expect the racing dial Mk 2 to command a premium - so if you were to include bracelet cost, you're happy find could be worth around $2000, or a bit more.

 

This is aftermarket 100%