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This is an interesting watch. It belongs to my Dad and it was gift from King Hussein of Jordan in 1969. My Granddad and uncle - via ham radio in Ilford - were King Hussein's only communications link with the outside world in the 1969 civil war with Palestine. After the war he sent them 2 personalised Longines watches. My Dad inherited this one from my Grandad. He's asked me to service it for him which I'm planning to do this weekend. I also want to look into getting re-plated as the gold has worn away quite a bit. If anyone knows anyone in London who they can recommend please let me know.

for today a recent addition to the collection -

Dear guidovelasquez, yes you are right. The piezo is the most common solution. The mic solution is more suitable for who is not very familiar with electronics. You always have to thing that making properly working pair (sensor + amplifier) covers two good jobs - mechanic and electronic. Booth are important. Bad mechanic job you can ruin your perfect amplifier and vice versa. Actually I have been working how to connect this sensor with SW. My very fresh experiences till now is not optimistic again. Very first sharing experiences with tg-timer SW: 1. Miyoto some movement - working well, detection ok. Tg SW works as I expect. 2. Junghans Kal75 - working movement but not properly - SW says no detection. My oscilloscope displays me quite usable signal but SW is not able to recognize that. User cannot recognise why. If is there a problem with sensor or somewhere else. 3. 90 yrs old movement - also proper signal but different shape. The same situation as previously - no detection https://www.ebay.com/itm/40pc-Vintage-Gold-Rectangular-Oval-Lady-MOVEMENT-Parts-Watch-AS-IS/132771982027?hash=item1ee9d3aacb:g:te8AAOSwCCVZtzA- My movement is below 912 numbertg-timer Sw is nice piece of work and but actually have some limitation. And I would like to share my experiences. So my target is to explain usable solution (sensor + PC +SW) for most people. Is never-ending truth if you are beginner you should not be able to recognize where is the problem. Improving previously described solution is always welcome! Anyway, feel free to use MAX4914 pre-amp with piezo. You have to add one stage - impedance converter and remove bias from MAX9814. Something like this: http://sound.whsites.net/articles/high-z.html I was not successful and patient enough this way . cheers

Hello B52. Thank you very much for sharing your experiences. We will have to test your project. However, in our limited knowledge and experience we have seen that what has worked best is the piezo electric disk. We know that it has its weaknesses, but even so it can be efficient. One of the reasons why we see that it is so, is that most time machines, use the principle of the vibration sensor instead of the microphone. For the same reasons that you have exposed: The background noise. We would like you to put us a piece of recording in wav or mp3 to check your results. Congratulations. And thanks for getting in touch with other elements that could be used. I would like to know if there is a pre-amplifier with a similar presentation to which you show us.

Vintage Grand Seiko Hi-Beat on a Sting Ray Band..... 5641-7000.....

Update on this . Bought a new mainspring after Ranfft numbers and now it's running much better . The new spring is 0,10 thick. Measured the old when i removed it and that was 0,12 . So it was to strong for the job.

Wishing you all the best. This is a picture today from one of the main news sites here in England. Have you got your gun?

Good that the row boat is ready to go when the blowing rain gets too heavy and the flood starts.

There is a website called THE GREAT BRITISH WATCH COMPANY by Colin Andrews. Colin completed both the BHI and WOSTEP courses and is now a professional watch repair technician. His website covers many of the challenges he faced getting through these schools and his employment situation after graduating. The part that is of interest for this topic is his discussion of what he went through learning how to turn watch pivots with a graver and T-rest. All of his articles are very informative but the article on making watch pivots is of particular interest for this discussion. As different people have different backgrounds, budgets, skill ranges, and different ways of attacking a machining problems, the really important issue is having control over the process and producing a correct part. Using a cross slide requires requires more equipment but an understanding of how to adjust, and in some cases repair, the cross slide mechanisms is really needed to get the desired result. The cutters used in a cross slide can be more critical and complex because they are mounted in a fixed position and will not cut properly if the relief and cutter angles are incorrect. This requires additional skills and equipment. Once everything is properly adjusted and set up this process can produce extremely precise and repeatable results. Using a graver requires less equipment to adjust but requires more hand manipulation during the metal removal process. Since the graver angles are adjusted during the cutting process the angles on the cutting tool itself are less critical. The approach to removing metal is very different as you are physically moving a cutting tool a distance that can not really be seen. This is why a shaft is first cut to a taper and the part to be fitted is moved up the taper during the cutting process. If the process was more controllable you would simply turn the shaft to the correct cylindrical diameter and press on the balance wheel. Removing metal with a graver was around centuries before cross slides were invented. Products were made by hand fitting on part into another part. The system worked but problems arose such as slow production and a lack of interchangeability. During the American Civil War Eli Whitney came up with the concept of interchangeable parts for the manufacture of rifles. The cross slide allowed the application of mathematical concepts such as the Cartesian Coordinate System, Trigonometry and Analytic Geometry to be directly applied to the manufacturing process. david