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Discussion Starter · #1 · (Edited)
Watch is no longer available. Possible trade: My Marathon-Gallet Steel Navigator from June 1990 for your Seiko 7549-7010 Tuna or possibly a SBBN015 Tuna. Navigator was recently serviced by Jack at IWW installing a new Quartz movement, cleaning, new seals, battery and a successful pressure test. Operating perfectly as you would expect from Jack and is good to go for another 30 years. The watch is in outstanding condition as you can see in the pics. This version with a date complication was a prototype so I’m not sure how many are around , if any. It’s certainly a rare Navigator model.
Looking for your Seiko 7549-7010 Tuna in comparable condition, may also consider a SBBN015.
 

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Discussion Starter · #2 · (Edited)
Some questions answered.

Navigator stats:
case diameter 42mm
height 11.25mm
lug to lug 47.5mm
lug width 19.5mm, fixed lugs

It’s similar in size to the original Benrus type I and II. It’s a few mm smaller in lug to lug, width and height than the MKII Paradive. For those who find the Paradive a bit large will find that the Navigator will hit the sweet spot.

The case is the all-original bead blasted stainless steel finish.
 
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