It is perfectly OK and the Miyota 8215 movement in this invicta is a fine Japanese movement
The Miyota 8215 and ETA 2824-2 are two Automatic Date movements that have been around for years. Both are fine watch movements that are dependable and accurate. Both are used by several watch makers world wide.
The Miyota 8215 is used in such brands as Camel, Citizen, Dugena, Festina and Invicta. Miyota is owned by Citizen in Japan.
The two movements, while similar, have differences that set them apart, both in functionality and application.
Cost - The 21 Jewel Miyota 8215 costs about $37 and is used in watches priced from $100 and up.
BPH - Beats per hour. 21,600 or 6 beats per second (3 Hz) for the Miyota 8215.
Accuracy is generally better on movements with higher BPH. The TimeZone has an excellent article on the subject.
Jewels – the Miyota has 21 Jewels. Jewels, typically synthetic rubis are used in watch movements, not to add to their value, but to reduce friction and wear on moving parts. Lower end watches may have only 7 to 15 jewels. The standard for quality watches is 17 jewels or more. There is an upper end to the number of jewels necessary, typically, anything over 25 jewels for these types of automatic movements are just for decoration.
Power Reserve - Power reserve is the number of hours a movement will run when fully wound. Most mainsprings will power a watch for 30 hours or more. The Miyota has a 45 hour reserve.
Winding Mechanism – winding rotor that winds the mainspring with the movement of the wrist. The Miyota employs a ball bearing unidirectional winding rotor.
Second Hand Drive – The Miyota employs an indirect second hand drive . The second hand on the Miyota may appear to stop for a moment with various wrist movements, but this does not affect accuracy.
Shock Resistance – The Miyota uses its own proprietary shock resistance on the balance (Parashock).
Hacking – Not there. The second hand does not stop on the Miyota 8215 when setting the time.
Date set – the Miyota have the quick set date function.
Based on price, the Miyota 8215 by Citizen is a great value and would be a good choice in an everyday watch or weekend beater.