This is my other Vostok watch. It's a little pricier than the Amphibia (my guess is because it has a date window at 6 o'clock) and has a different movement than the Amphibia that I own (Vostok 2416 vs 2415). They both have 31 power reserve and 200m of water resistance (pretty amazing for a watch that costs less than $200). This particular model gets me +18.03 seconds per day which isn't bad since Vostok rates the movement at -20/+60 seconds per day. All in all a great Russian made watch :)