Omega Cal. 1120 Power Reserve Test: Manual & Auto Winding

Hi all,

I've been doing some tests with an Omega Calibre 1120 and thought it would be interesting to share.

- Last service: December 2025 (1 month ago)

1. Power reserve test via manual winding:

- Watch stopped, dial up.

- 60 turns of the crown (each turn rotating the crown between 240 and 360°).

- Power reserve: 47h31min

2. Automatic winding test:

- Watch stopped, placed on the wrist and started by wrist movement.

a) Wear for 4h08min (less to moderate active activities, such as driving, using a computer, sitting for a conversation, etc.). Power reserve of 8h02min.

b) Wear for 1h54 min (more active activities, done in an office, almost entirely standing, including some short walks). Power reserve of 8h22min.

My conclusions:

1. The advertised 44h power reserve is slightly underestimated, at least for recently revised movements.

2. Wearing life style greatly influences the power reserve reload by automatic, but a metric I consider reasonable is to think that each hour of wearing gives us between 2 and 4 hours of power reserve.

What do you think? Anyone with other data?

I find with a full wind, the power reserve for my 1120 movement is close to 48 hours (I certainly get a few more hours that the rated 44 hours).

I've never tried putting on my watch that's stopped and just wearing it to charge it up. If the watch is stopped, I wind it (approx. 30 turns) then wear it. I find it easily reaches full capacity after wearing for half a day doing this. But I haven't tried testing it the way you did. This is just what I noticed after wearing it over the years in my rotation.