Some specifications for this reference are on file; the record is incomplete.
Seiko · Prospex
Turtle
Ref. 6309-7040
Authentication Notes
Regional
-7040 and -7049 are the same watch for different markets
The differing final digit reflects the market and the day-wheel language supplied, not a different specification. Neither is rarer or better than the other, and a listing that presents one as a superior variant is inventing a distinction.
Service
A modern-lume dial in a 1970s case is a service dial
Seiko supplied 6309 replacement dials with modern luminous compound long after tritium was discontinued. A dial glowing strongly and evenly in a watch whose hands are aged is the signature. This is authentic Seiko service work and should be recorded as affecting originality only.
Inspection points
No inspection checklist has been published for this reference.