Vintage Bulova Accutron Depth Gauge Monnin PVD Cased Divers Tool Watch

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The Watch
Very Unusual Monnin Cased Bulova Accutron PVD Diver dating from 1980.
The Watch boasts a 38mm Blacked out PVD case that has one of the coolest and unusual dive features, a Depth Gauge built inside the Crystal.
This is an interesting watch, I've only seen a few other examples of this model.
We have had one with the same case before that was branded  "Alpha" that sold almost instantly.
How the Depth Gauge Works
The Crystal is surrounded by a Capillary Tube, with a small inlet milled into the Specific Crystal at 3.
The inlet allows water into the channel as the diver descends into the deep. As pressure builds, the air in the channel is compressed and water pushes its way into the channel. The depth is read on the scale around the dial thanks to the separation between the air and water.
*Please note that this function has not been tested it is now a Vintage Timepiece, it has NOT been tested for Water Resistance and if you wish to Submerge this Watch, you will need to have the Watch Professionally Resealed before doing so!!*
View this Depth Gauge in a Video: here 
The Specs
Age:  Date coded for 1980.
Reference: 8456
Movement: Quartz, with Quickset Date and Hacking Seconds.
Calibre: 2633.10
Timekeeping: Keeping good time within the reasonable expectations.
Service History: Unknown.
Dial: Original Bulova Factory Dial.
Case: All Stainless Steel PVD Monnin Case.
Measurements: Without/With Crown: 38mm/42mm End of Lug to Lug: 45.6mm  
Bezel: Uni-Directional 60 click Bezel.
Water Resistant?: No.
Hands: Original Handset.
Crystal: Original Depth Gauge Crystal.
Crowns: Original PVD Unsigned Crown.
Strap/Bracelet: On a NOS PVD Black Stretch Bracelet.
Lug Width: 20mm
Getting Acquainted
Bits that stand out:
- Seldom seen Reference.
- Fantastic Iconic Case maker.
- Cool PVD Case.
-  Original Depth Gauge Crystal.
-NOS PVD Stretch Bracelet.
Nitty Gritty:
-Minor Scratches throughout the Case, Bezel and Crystal.
- Original Crystal seems to have tiny chips around the edges.
- Original PVD Crown fully functional but PVD coating has worn.
- Small bit of Tritium missing from Hour Hand.
Overall the Diver is in Good honest Vintage condition, the Case has some very minor scratches that are to be expected really with Watches of this Nature.
The Handset is Original and in good condition.
The Dial is in very nice nick, as if you can't tell by now I am a huge fan of this Watch.
Crystal is Original, it has some small chips around the edge.
Original Unsigned Crown, with wear.