1965 M-65-2

One of the interesting niches of vintage Hamilton watches is the M-series.  M stands for Men's and there's an F series as well, for the fairer sex.  They're known to exist but not well documented.  However, they do show up in the 1964 catalog... or at least 12 of them do. 

The M series is believed to have been introduced in 1961 and produced through 1969.  As far as I'm aware, there are 26 M-series models and you can see the 12 that were available in 1964.

Conventional wisdom, or at least my opinion, is the model line was intended for a nation-wide distribution partner.  If you're old enough, you might recall the pre-internet days of catalog stores like Service Merchandise or Best, among others.  These nation-wide chains sold fine jewelry, and the like, through both catalogs and physical stores where you could shop the catalogs and the staff would pull the items from their storeroom.   I have yet to find any advertisements that prove this theory or identify the retail partner, but you can spot an M (or F) series model in the wild when it comes with it's original box - as the box is red.

The nomenclature behind the M series models is not very complicated.  M is for mens and the numbers represent the retail price and the count of that model at that price.  So for example, the first M series model offered at $59 was the M 59-1, the next model at that price would be the M 59-2.

My most recent M series project is an M 65-2.  It's known to be shown in the 1965 price lists but not in the regular retail catalog.  It's artistic rendering leaves a little to the imagination.

The M 65-2 was the second model priced at $65.  It was offered in a 10K RGP bezel with a stainless steel back.

My real life version is true to the rendering, as you can see below.  It looks pretty good but it's not running.  It is fully wound and that brings up an interesting term... "over wound".  That term gets used a LOT and it's a bit of a pet peeve of mine.  The term is valid in certain time pieces, like clocks, when it's wound a little too far to actually release power through the train... like it's jammed.  However, in watches, the "click" prevents the mainspring from jamming like that.  

So an "over wound" watch isn't running because it's been wound too much, it's just not running for some other reason.  I would liken it to a car that won't start, even though the gas tank is full.  It's not "over filled", it just won't start for some reason.

Anyway, there's lots of reasons for a watch to not run... it could be as simple as the minute hand touching the 1 marker or the second hand touching the hour hand.  (that's not the cause for this watch though).

Looking closely at the stainless steel back, I can see a seam between the back and the front so I suspect this case separates.  You have to be really careful though, as often this sort of design opens through the crystal.

My instincts were correct, and the two halves separated easily.  The dial and movement rests within the case back and I should be able to simply lift it out at this point.

Tucked behind the dial is a Hamilton 686 movement.  This is a pretty common Hamilton caliber for entry-level Hamiltons in the 1960s for models with sub seconds hands.  $65 wasn't "cheap" in 1965.  Adjusted for inflation, that's about $700 in today's dollars... pretty much in line with today's Hamilton entry-level models.

There was a little bit of a rattle inside the case.  I think it was simply the movement assembly wigging in the case.  A new crystal is a little thicker then what came with the watch (right), so I'll see if that helps to tighten things up after reassembly.

Everything is cleaned and dried.  Well.... almost everything.  After I took this photo I realized the pallet fork was missing.  After a few minutes of searching, I found the pallet fork on the floor.  It must have dropped during the transfer process from rinse to rinse.

I've got the movement reassembled to the point that power flows smoothly through the wheel train.  Next step is to wind it up and reinstall the balance.

I installed the balance and it wouldn't come back to life.  I realized it's way out of beat... meaning the impulse jewel isn't lined up with the pallet for.  Check out the photo below and the position of the impulse jewel (at 9 o'clock) and the hairspring stud at about 11:30.

Installed on the movement, note the hairspring stud is almost in alignment with the pallet arbor and escape wheel.  Instead, the impulse jewel should be aligned with them, so this balance needs to be rotated counterclockwise about 45 degrees.  That would definitely explain why this watch was not running.

In the photo below I made a best-guess adjustment to put me in the ball park.  The only way to tell for sure will be with the timer.

With the balance closer to being in beat, the watch comes back to life and is ticking away with a good motion.  Now I can install the balance jewels in the balance cock and then check the timing.

Well... it's running really slow but the beat error is good and the amplitude is fine too.  Fortunately that's an easy adjustment, I just have to move the regulator and "shorten" the hairspring.

A tweak here and a tweak there... eventually I bring the beat rate in line.  Note the difference in position of the regulator relative to the hairspring stud.  I moved it quite a way.

Now the beat rate is fine but I moved the balance out of beat a little.  So now I just have to tweak the hairspring stud again.

It didn't take too much, as you can see if you compare the photo below with the one above.   I have no idea why this balance was so far out of adjustment.

Regardless, now everything is looking good to go... a couple of further tweaks brought the beat error down to near-zero.

Welp... I went to install the dial and hands and the balance stopped.  I took the balance off and the gear train was locked up.  What happened?

Looking closely, I could see the escape wheel was out of position.  Did I break a pivot?  Is one of the jewel broken?  It was a good opportunity to use a new tool I recently acquired... it's microscope with a large screen so I can see what I'm doing with great ease.

Looking at the escape wheel jewel on the main plate, everything looks fine.

Looking at the jewel on the train bridge, I can see it's not cracked but then I realized it's missing the cap jewel.  This is another great reason why the watch would be dead on arrival and not running.

I pulled out a donor 686 and you can see there should be a shock spring and cap jewel on the escape wheel jewel.  At this point I can swap jewels or just swap bridges.  I'll go the easier route and just swap jewels.

Alrighty then... back to the drawing board and after cleaning the new bridge, I start the reassembly process.

The reassembled movement is now running again.

The performance is the same as it was before - that's not surprising though, it's the balance that counts the most and the train bridge was nice and clean.

It was smooth sailing from this point and the reassembled watch looks great behind the fresh crystal.  It still had a tiny bit of rattle though so I put a teensy dollop of rodico putty between the dial and case back to dampen any movement.  Now it's as tight as a drum, and it runs as good as it looks.