Overhaul Procedure – Omega Seamaster 300 (Omega 1120)

Up today is a fairly straightforward overhaul of an Omega Seamaster 300 with an Omega 1120 movement. An 1120 movement is basically a glorified ETA 2892. There are a few differences that Omega made, but nothing major. The ETA 2892 is a great workhorse of a movement which doesn’t always get a lot of love, but it’s a solid caliber.

Here is the watch in question.

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Seiko 6139-7100 ‘Helmet’ Chronograph

I have been getting a lot of requests lately for Seiko servicing and restoration. Traditionally, it wasn’t something that I did as I stuck to Swiss movements but the more I have been doing the Seiko 6139 the more enjoy them. I think they are going to be something that I start taking in a lot more of. I know that many people collect them but there aren’t many watchmakers who take them on.

Vintage Seiko’s can be had for not much money in today’s insane vintage market. They are an incredibly reliable movement and having been designed in 1969 they still stand up today. They share a lot of similar architecture with the Rolex 4130 movement which was developed several decades later.

Here is the Seiko 6139-7100 ‘Helmet’ chronograph. Such a great design in my opinion.

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Re-Bushing A Barrel – Omega Speedmaster 321

Re-bushing a barrel is such a crucial aspect of watch servicing, but it is seldom done. Anytime a watch doesn’t have a jeweled barrel or center wheel, there will be wear.

A barrel and center wheel have steel arbors or pivots. When they use a jeweled bearing the jewel is the harder of the two materials. When they just sit in the brass mainplate and bridge the steel is the harder of the materials.

Due to this fact, the plates wear before the pivots and arbors.

When this happens the plates must be drilled out and new brass bushings need to be installed.

The arrows below point to the plates that have worn holes. That is where we will drill and install the bushings.

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Reading & Understanding Watch Timing Machine Results

I see a lot of people on watch forums these days have purchased a watch timing machine to be able to see how their mechanical watches are running. I have noticed that most of them don’t know how to accurately read those results to get a clear idea of what is going on. I have made this video to hopefully clear up some of that confusion and help you to understand exactly what the numbers mean.


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Overhaul Procedure – Rolex Explorer II (3185)

This Rolex Explorer II wasn’t recently brought in. In addition to a standard overhaul, the customer wanted to update the look and change the dial and hands from black to white.

Here is the watch as it was brought in. Black dial with silver-colored hands.

I opened the watch to perform my initial checks and make sure no other parts were needed.

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