On The Bench; Benrus MIL-W-3818B Vietnam Era Service Watch

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Acquired out of an estate sale for an old vet, Benrus DR 2F2 MIL-W-3818B service watch.

Crown & male half of the split stem missing, hands not advancing at all in response to jiggling, lifetime of not-too-gentle use.



1964 service date. Don't have any way of knowing if this piece was on tour in Vietnam, but the calendar lines up.



With the crystal off, the watch actually starts running, seconds hand was fouling on the underside of the crystal.

From the factory, the hands were lumed but the dial was not, but then at some point in its past the watch had lume added to the dial. See this a lot in this vintage of service watch, & looks like a pretty amateur application in this example, 6 gets a double helping & 5 gets nothing...



Now I have to make a decision about what level of restoration to apply on this project. Normally I would prefer to do a sympathetic restoration; try not to add anything, try not to remove anything. But, some other guy beat me to it this time, so now need to figure out what it means to unbastardise this piece...




ETA 2372 base movement with hacking added in the conversion to the DR 2F2. Little bit grimy, but running & looks complete (but for the crown & stem :-p).



Getting it broken down for cleaning.



The DR 2F2 hacking lever. When the stem is pulled out to setting position the hacking lever rotates & presses the hacking pin into the side of the balance wheel (looks pretty crude, compared to the crafting & finishing of the rest of the components...)



Fundamentally it's a pretty basic watch, 3 hands, hacking, & that's it. Doesn't fill up very many cubbies in the parts tray. Off to the cleaner.



Now to deal with the cosmetics for the dial & hands. Not something I have much expertise in, but ready to try something new & learn as we go...

The Geiger Counter was quiet for the dial & hands, so whatever was applied before was not Radium. Gently scraped off the grotty looking old lume, but that still took off the paint for the hour index underneath. So, let's see how some flat white acrylic model paint looks.


It's not perfect & it never will be, but looks like an improvement to me at least.


More to follow...
 
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Brave putting tape on a vintage dial...
 
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Brave putting tape on a vintage dial...
Indeed so but this blue 3M painter's tape is some pretty special stuff. Its tack is very low, because it's designed to not pull up whatever it's stuck to, whereas traditional "masking tape" has a much higher tack and gets permanent over time.

I think the only adhesive with lower tack is a Post-It note.

I use this blue tape for a lot of things that are intended to be temporary because you don't have to worry about leaving adhesive behind.
 
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I've seen lots of dials that if you breathed on them the finish would come off, but in this case it seems to have worked out fine. 👍

This doesn't appear to be a customer's watch, so if it goes wrong at least you aren't left trying to explain what happened to an angry collector!
 
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...
This doesn't appear to be a customer's watch, so if it goes wrong at least you aren't left trying to explain what happened to an angry collector!

Correct, I am a hobbyist with a few years experience tinkering with movement restoration. All the watches on my workbench including this Benrus are my own.
 
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... and on to the hands.

None of them look great. Kinked, corroded, & an odd assortment of previous coatings.



Some fiber pen to scrub out the old lume & gentle sanding with some 2000 grit to get most of the way down to bare metal.



Straightened out & ready for a thin coat of paint & fresh lume. Don't exactly know how the hands were finished when new, but most of the pictures I have seen of other MIL-W-3818B watches have the hands painted white.



On to the reassembly.

The female (movement side) of the split stem appears bent out of shape. Likely contributed to the male half & crown being lost.


This part can be replaced with NOS ETA 2372, & these are fairly easy to find.


Keyless works



Going train



Crown & ratchet wheels


Moment of truth...



And off she goes...

This is always a good feeling.

Before we can do the final assembly, need to acquire a replacement for the missing half of the split stem. Since these are the pieces that commonly go missing they are also the pieces that have long since run out of replacement supply. Time to improvise...



And many iterative cycles of this kind of fiddling...




Stem trimmed up & ready to turn this thing back into a watch.



Thanks to all the vets, young & old, & to the folks who love them & miss them when they are far away from home.
 
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Thank you for posting this; super cool! And nice watch!!
 
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Thanks to all the vets, young & old,
As a Viet Nam era vet, I was totally mind-schwazzed by your work!
Maybe not exactly per horologic traditions but a very typical "let's go with what works" approach.
I collect service watches and would be honored to "dibs" if you ever....
 
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Not to bitch, but that bright blue lume seems weird for the time. (Unless seen under a blacklight)
 
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I so do hate a US service watch on some Commonwealth trash strap. 😁
Had the Canadian invasion of the US been successful in the mid 90s you would be part of the Commonwealth…😝

Damn that guy looks like @UncleBuck
 
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Not to bitch, but that bright blue lume seems weird for the time. (Unless seen under a blacklight)

The dim lighting & the digital camera image processing combine to show the blue tint in the original photo. In real life the fresh lume glows distinctly green (just hard to get a photo that's true to colour...)

 
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same same: BULOVA (relumed) UV-light



edit: case back:

Very cool service watch.

Would be interested to know the movement calibre.
 
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Indeed so but this blue 3M painter's tape is some pretty special stuff. Its tack is very low, because it's designed to not pull up whatever it's stuck to, whereas traditional "masking tape" has a much higher tack and gets permanent over time.

I think the only adhesive with lower tack is a Post-It note.

I use this blue tape for a lot of things that are intended to be temporary because you don't have to worry about leaving adhesive behind.


Blue painter's tape just keeps surprising me with it usefulness. It seems I just keep finding more every couple of days.