You want a Cal. 8500 you say?
I know exactly where to get one!
First you must venture across the Atlantic, battling waves and storms unbeknownst to the untraveled man. Once you manage to hit land, a trek across Europe will await you. There will be drug lords, hookers and Bonesey standing in your way. Make it past them and perhaps, just perhaps you'll have a chance encounter with Mr. Stephen Urquhart, CEO of Omega SA.
If you do indeed find Mr. Urquhart, you must slay him. Once the deed has been done, you will be required to surgically slice open his chest and there, ticking away at 28,800 beats per hour lies the Omega Cal. 8500.
Best of luck.