Hi there!

I own my first Curta for about 3 years now. It occured to me I am not doing any maintenance.

What should I do for the unit? And how often? I am going to try to use it at least 1 every 3 mos now so it doesn't stick.

Thanks!

The best maintenance for mechanical calculators (not just Curtas) is to exercise them now and again. I’d suggest every month or so that you do a division calculation - this ensures that subtraction and addition is performed in each carriage position. I have nearly 100 mechanical calculators of various types, so this schedule is not always easy - but I do try to exercise all of them at least twice per year. Also, keep them somewhere warm (room temperature).

Best Wishes
John