This has been on a window sill in sunny room 24/7 for about three months now. Sweden is not very hot in summer, but it is light all the time so the amount of sun and light is way more than in most countries.
I have not treated it with anything, but it already had a nice patina and glow from being handled daily for 14 months. It may probably have been drier if I had done this from new.
Categories: Filofaxes and other ring organisers