Hi
@wx_073
[emoji1] [emoji14] You're gonna get an Amazing Avalanche of answers to your question soon enough.....
My knowledge is rather limited . All i know is there are lots more Non Magnetic alloy parts inside METAS cert calibre 8900 like the lever , escape wheel , balance & balance screws including the Silicon balance spring making the whole watch
able to resist Magnetic Fields of at least 1.5 Tesla. MRI scanners have Magnetic fields ranging from 0.5 -7.0 Teslas ...& Yeah..For Gods Sakes DO NOT attempt a Stupid Stunt of placing a calibre 8900 inside the MRI. Your baby will survive no doubt...but Somebody's gonna pull out 3 Million U.S Dollars out of your A$$ to replace the damage MRI scanners...
Check out all the other answers from some brilliant minds around in the forum