Does anyone else on here collect these, or have an interest in them?
For quite a while, Waltham offered a non-magnetic hairspring and balance wheel on many of their watches. I'm not exactly sure when they were first offered, but believe it was around 1890, and probably continued until 1910 or so. The hairspring contains platinum and palladium, as do both layers of the non-magnetic balance wheel. Watches could either be purchased fitted with the non-magnetic balance and hairspring, or refitted at a later time.
Many also had a non-magetic phosphor bronze roller table and pallet fork.
Non-magnetic watches can be found both marked and un-marked "Non-magnetic", but the tell-tale feature on both is the white balance wheel and white split bi-metallic balance. Some also had tell-tale platinum timing screws on the balance wheel.
Here are a few of mine