seiko 150m diver 7548 7000 black 1930s but the mechanical system is

but the mechanical system is different

グランドセイコー セルフデーターという名の第2世代のGS。1964年製。

so some people start to collect it

The interesting point is that the indexes are split in the middle

NOS sealed condition with original strap

seiko 150m diver 7548 7000 black 1930s but the mechanical system isThe 7548 Diver is the successor to the 6309 Third Diver, which was introduced in 1979 as Seikos first quartz diver. It was the prototype design for the current mechanical diver, the SKX series ( Boy). Very good condition overall. All parts are original. It comes with a genuine Seiko rubber strap. If you want to use it with a bracelet, we recommend you to use the genuine bracelet for the current SKX. Warranty Battery and all gaskets are replaced before