Cal. 1570 GMT- tell me if I m wrong ?

[specialvat]

Looking at vintage options as you do, came across this:

I was under the impression that the GMT hand was driven by the date mechanism ?

Is this movement just a standard 1570 with a GMT wheel put on the top?

This is what I would think a GMT movement should be, can someone clarify please.

Thanks all, and happy new year

[RWG Technical]

Stay away from the top version...it is an absolute piece of CRAP.

Someone tricked me a few years back by not being up front and honest and sending me a 1655 with this garbage inside..."lets see, if I don't say anything...he won't know...he he he..."...well I had a bad feeling as soon as I removed the dial, instead of re-assembling and going on my guts, I decided to service it...what a nightmare, with the garbage movement and with the customer who is no longer a customer.

Lets say it went to hell in a handbasket.

STAY away from the top one at all costs...you would be better making up your own modification with some rusty nails and pieces of garbage found on the road.

Don't be fooled like I was.

[specialvat]

Thanks R, I got a reply to my question from the seller stating he is not a watchmaker but he s sure its complete.

Now I know its complete alright, complete rubbish.

Thanks for taking the time to post your input means alot.

[Ronin]

So what is the story with the top photo? A modified GEN movement?

[automatico]

"So what is the story with the top photo? A modified GEN movement?"

Yes, it is a genuine 1565/1575 with a $2 modification to make it work like a gmt...for a while.

They use the standard minute wheel with a small accessory gear stuck on top to turn an ill fitting 24 hour wheel.

You can see the gear added to the minute wheel (the first brass wheel on the right side with the 'yoke' over it). Compare it with the correct gmt movement pictured below and you will see what has been done.

With this botch job, the hands are too close together and the 24 hour hand usually rubs the dial or hits the 12 hour hand. They are basically jamming 4 hands on a 3 hand movement.

Here is most of what is needed to convert a 1565/75 to a 1565/75 gmt:

#8038 - center second pinion 5.70mm

#8037 - Cannon Pinion 3.39mm

#8039 - hour wheel with double toothing 2.44mm

#8040 - 24hr wheel 1.41mm

#8035 - Calendar Wheel nut

#8036 - Date Jumper

#8006 - Yoke for cam

#8008 - spring for cam yoke

#8011 - stud for cam

#8030 - Center wheel with Cannon Pinion

#8034 - Calendar Wheel

#8011 - Stud for Cam

#7965 - calendar spacer

Q...What is hard to find?

A...All of it.

Q...What is almost impossible to find?

A...#7965 - calendar spacer

#8034 - Calendar Wheel

#8039 - hour wheel with double toothing 2.44mm

7965 usually goes from $200 to $500

8034 usually $200 to $400

8039 usually $200 or so

Q...What else is needed?

A...Two cases of Jack Daniels and $2000+/-.

[Ronin]

Thanks Automatica...

[specialvat]

Brilliant info, and a warning that a little research is always advisable

[Original Scope]

Thanks for the info Automatico!