Spencer Klein of kleinvintagewatches might be of help. These use the same movement as the H601-5480, sometimes known as the 'upside down Arnie' which some do collect, so I would guess there should still be people out there doing repairs for this caliber. In terms of spares, I would think that finding a junked h601 on the bay with a good lcd panel would be a good idea. A search on the bay also does show an LCD panel part for your particular caliber being listed as NOS. I'm no expert on these as well, just sharing what I know.
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