This is a very nice Seiko 6138-3000 chronograph I recently fully serviced for a ClockSavant customer. The 6138-3000 model is larger than many other models and is referred to as the Jumbo model. Its styling is somewhat more subdued and classic. This is an excellent example and after servicing is running superbly. While accuracy can vary with many factors, it is now running within several seconds a day of accuracy across all positions with excellent amplitude, near zero beat error and full power reserve.
