A nice Parnis open heart (balance), 50Hrs power reserve and day calendar complication watch with a Seagull 2505 caliber. A Chinese watchmaker, a beater for a cheap price.
Automatic movement with double bridge, suitable for "open heart" applications (from the dial visible balance, in the style of Vacheron Constantin). 25 jewels, 21,600 vibrations, 48 hours power reserve, ball-bearing rotor. In-house development by Tianjin Seagull from the year 2000.
If you want to read more about the recent history of Parnis; here.