Thanks for visiting my vintage Hamilton watch blog. I like to restore US-made Hamilton wrist watches back to their original glory and share my experiences with other enthusiasts. Use the "Search" space below if you know what model you're looking for. Feel free to leave polite comments or questions in the spaces provided. Also check out my "watches for sale" on my Etsy site - the link is on the right, just below.

Saturday, January 25, 2020

1957 Astramatic I

There's a great Hamilton Watch Company video from the late 1940's called "What Makes a Fine Watch Fine".  It begs the question, if the most basic Hamilton watch is a fine watch, then what makes an exceptional watch exceptional?

There is one series of Hamilton models that arguably fits the label of exceptional - or at least the best that they had to offer in 1957 - the Astramatic line.  There are only two Astramatic models, the Astramatic I and the Astramatic II.  Both models are one-year-wonders though, so you'll be hard pressed to find either of them.  They are the only models to utilize the 25 jewel 664 movement.

Of the two, the Astramatic I is the cat-daddy and arguably the flagship of the entire 1957 model line.

There are only about a baker's dozen solid 18K models and the Astramatic I is a member of this elite collection.

I recently had the opportunity to work on an Astramatic I.  It's only the second time I've come across one, so it was a real treat to restore it.  As received it was in typical "as-found" condition with a few bumps and bruises and a slightly cloudy crystal.

The solid 18K case back is on tight!  18K is fairly soft, as metals go, so I'll have to be very careful not to gouge up the case back by trying to open it.

In situations like this I'm glad that I've invested in the best tools that I can afford, like a Bergeon case holder and a Bergeon case opener.  Less expensive tools might look similar but it's quality that counts in situations like this.

A little penetrating oil helps free up the couple of decades of dried DNA holding the case back in place.  Finally it broke loose without any damage.

I don't see any evidence of prior watchmakers inside the case back... I wonder if I'm the first person to look at the movement in over 60 years?

The 25 jewel 664 movement is essentially the same as the 661 movement used in the Automatic K-series of models, except there are 8 additional jewels inside.  Although this is a very rare movement, it's not hard to find parts for it since there are lots of 661s out there.

Despite the radium-based lume on the hands, the dial only shows a slight amount of radium burn on the surface.

If you look closely at the automatic framework you will see four jewels that you won't see on the framework of a 661 movement.

There are four additional corresponding jewels below the framework, bringing the total jewel count to 25.

The movement is completely disassembled and ultrasonically cleaned.  While it was in the ultrasonic I replaced the crystal with a fresh one... that alone will make a nice improvement.

The basic movement is reassembled with fresh oil and now ticking away with good motion.

It's running a smidgen fast but a slight tweak will slow it down.

There... 13 seconds per day fast is a good place to leave things.  It will slow a little after everything settles back in place.

The reassembly of the movement is completed and everything is installed back in the case.

I cleaned the case up and gave it a very gentle polish so that I wouldn't lose any of the crisp edges.  There are still a few marks from prior wear but that's preferable to an over-polished case with soft edges.  A new crystal makes this 63 year old watch look like it just left the showroom floor.  I'm sure the owner will be delighted to get it back on their wrist!  However, I believe this watch will be for sale so if you're interested in it let me know and I'll put you two in touch!


  1. Hi Dan,
    You wrote "It begs the question, if the most basic Hamilton watch is a fine watch, then what makes an exceptional watch exceptional?". I'm curious to know your impression of the watch. Besides the higher gold content and extra jewels, did it seem exceptional compared to other Hamilton watches?

    1. Fair question... what’s the difference between good and great, especially after 60+ years? Is a Cadillac really better than a similarly equipped Chevy? Does rarity count?

      The extra jewels in the 664 are in the framework and don’t impact time keeping. So it’s basically a 661.

      To me, exceptionality is a function of rarity, current condition and provenance. As for this particular Astramatic, find me another to compare it to and I’ll tell you which is better.

  2. That is such an interesting case and lug design. Did the owner ever find a buyer?

  3. Great article and info. I have one of these in super condition, barely worn I think. Do you have any production info? Value?

    1. No, I'm afraid not. It's a rare watch though for sure.

  4. I got one , great condition, what is worth 18k astronomic 1

    1. Hard to say. Put it on eBay with a $20,000 reserve and see what price the bidding gets up to when the auction ends... that's the value of it. If it sells for over your reserve, you did well. But it would probably be more like $900 because people wouldn't know what it was.