The Davosa caliber DAV 3023 is an automatic watch movement with a day-date calendar complication. The DAV 3023 is basically a Davosa branded Sellita SW240-1, which itself is a clone of the ETA 2834-2.
Davosa’s official description of this movement (mostly a repeat from above):
“Automatic winding | bidirectional winding ball bearing rotor, quick date correction, second stop device, Ø 29 mm, H 5.05 mm, 25 jewels, 28.800 A/h | power reserve 38h | hours, minutes, central second, date, weekday” –source
On the same page, Davosa also says this about the movements found in their watches:
“All DAV calibers are made in Switzerland by well-known movement manufacturers such as ETA, Sellita, Soprod and others. Every movement receives our utmost attention in terms of both materials and quality. Precision, reliability and level of performance are the key features of all our products.”
What grade of Sellita or ETA does Davosa use?
From the marketing image presented on Davosa’s official movements page, the DAV 3023 appears to be a Standard grade Sellita with Incabloc anti-shock. However, when asked on the brand’s official Facebook page on July 5, 2018, the answer was that it depends on the watch:
“DAVOSA Watches We install movements of different quality levels – depending on the model. In general, however, all our movements are tested by us in different positions and, if necessary, will be regulated when they are installed, so that movements in the “standard” version can achieve the same accuracy as in the “top” version. In general, the movements only differ in the tolerance limits, which are guaranteed by the manufacturer, since each movement – whether in the quality level “top” or “standard” can be configured according to individual requirements /wishes. The general components in the movements are the same.” –source
If it’s true that the base movement for the DAV 3023 is a standard grade SW240-1, the expected average accuracy is +/-12 seconds per day with a maximum divergence of 30 sec/day in all positions. Sellita tests the Standard grade movements in two positions from the factory, but it’s possible Davosa performs additional testing prior to casing the movements.