u/jimmy801115

Hi everyone, I recently bought a second-hand Junkers Iron Annie JU 52 with a hand-wound Molnija 3603 movement.

I checked some information online and found that the power reserve is supposed to be around 41 hours. The seller told me that the watch had undergone a complete service about a year ago.
I also took the watch to a watch repair center for a water resistance test, and it passed the test. In addition, the movement amplitude at full wind was measured at around 300 degrees.

The issue is that, even when fully wound, the actual power reserve is only about 32–34 hours.

Would you recommend sending it in for a full service and mainspring replacement, or is this level of power reserve still considered acceptable for this movement? Thank you.

I’d like to share a few watches I’ve collected over time. Although none of them are particularly expensive, each one has its own unique charm that I really appreciate. I’m also quite fond of watches with power reserve indicators, so several of them feature that complication.