Grand Seiko 45GS 45KS See-through Caseback Grand Seiko

This was custom-made by ordering from a machine shop with a focus on its shape to match the Seiko style.

Compared to the previous model, the opening has been made smaller to hide the movement holder and presser, resulting in a more beautiful finish.

The material is SUS stainless steel, with a thickness of 1.2mm excluding the threaded part, which is the same thickness as the genuine case back including the medallion.

The skeleton part uses sapphire crystal for the windshield, and it is bonded with a 10 ATM waterproof adhesive for Seiko genuine glass.
The screw-in to the main case is very smooth.

■Compatible Cases■

45GS
4520-8000
4522-8000
4520-7000
4580-7000
4520-7010 etc.

45KS
45-7000
45-8010
45-8020
4502-7000
4502-7001
4502-7010
4502-8010
4502-8020 etc.

It will be shipped in a plastic case that can also be used for storing the genuine case back. Although it is a new plastic case, it may have minor scratches from the beginning.
Since many O-rings are deteriorated, a new O-ring is also included.

Please enjoy the 10-beat, 36,000 vibrations of the balance wheel and the movement of the gears during manual winding.

We aim for prompt transactions, so thank you for your understanding.

Grand Seiko Display Caseback