Difference Between M42 and M255 movement

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Tony
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Difference Between M42 and M255 movement

Postby Tony » Sun Aug 21, 2016 2:01 pm

I recently acquired a batch of NOS movements and among them are two which appear to be the same yet have different numbers.
These are labeled 42 and 255 respectively. To me they seem exactly the same, can anyone tell me the difference?

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Dadistic
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Re: Difference Between M42 and M255 movement

Postby Dadistic » Mon Aug 22, 2016 8:05 pm

I'm not that familiar with the electrics, so I'm not sure of the differences. I do, however, have the service manuals for both, and if you pm an email address to me, I'll forward them on.

Cheers!
I keep hearing the song "No Time Left For You" by the Guess Who playing in my head, but somehow the words become "No Timex Left For You"

Tony
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Re: Difference Between M42 and M255 movement

Postby Tony » Mon Aug 22, 2016 11:47 pm

Okay so, I knew the answer and was just trying to stir up an interesting post.

the 42 is for an electric and the 255 is for the Dynabeat.

Thanks for the offer of the technical documentation but, I already have a few copies in house.

Cheers.

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Dadistic
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Re: Difference Between M42 and M255 movement

Postby Dadistic » Tue Aug 23, 2016 6:38 pm

Well, I'll bite! As I said, I don't know much about the electrics.

What is the difference between the early electric and the Dynabeat?
I keep hearing the song "No Time Left For You" by the Guess Who playing in my head, but somehow the words become "No Timex Left For You"

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Re: Difference Between M42 and M255 movement

Postby Tony » Wed Aug 24, 2016 12:30 am

the answer is in Dyna "beat"...they run at a higher beat which makes their time keeping more accurate.

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Dadistic
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Re: Difference Between M42 and M255 movement

Postby Dadistic » Thu Aug 25, 2016 12:08 pm

Ahh! I found the rates by looking at the base models for the 42 and 255. The 40 runs at 21,600 beats per hour, or 6 beats per second. The 253 runs at 28,800 beats per hour, or 8 beats per second. Also, according to the manual -

In the Model 253, the contact spring assembly, seconds wheel assembly,
index wheel assembly and balance wheel assembly are different from
similar Timex Model 40 and Timex Model 50 parts.

Which brings up another question, the model 40 and its offspring are described as "electric" , and the 50 is called "electronic". Then the model 253 is back to being described as "electric". There must be a reason, but I'm not sure what it is.

Any clues?
I keep hearing the song "No Time Left For You" by the Guess Who playing in my head, but somehow the words become "No Timex Left For You"

Tony
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Re: Difference Between M42 and M255 movement

Postby Tony » Thu Aug 25, 2016 12:20 pm

good question, since again if you look at the two movements side by side you will not see any clear difference.

but, the electronic has an embedded diode built into the balance.

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Re: Difference Between M42 and M255 movement

Postby matlobi » Thu Aug 25, 2016 12:23 pm

I've found this to be a pretty good primer on Electric/Electronic/Dynabeat movements.

http://electric-watches.co.uk/makers/timex/
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Re: Difference Between M42 and M255 movement

Postby Dadistic » Fri Aug 26, 2016 4:44 pm

Oh, so a bit of semiconductor makes it electronic vs. electro-mechanical (electric). To me, it seems a distinction without a difference, but I bet it started out as a marketing differentiator. I'll go with it, why not?

Thanks!
I keep hearing the song "No Time Left For You" by the Guess Who playing in my head, but somehow the words become "No Timex Left For You"


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