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In preparation for the repair of my own chronograph, I found this one amongst the watch graveyard and decided to take it down and put it back together.  These are the photos of the disassembly.  After disassembly, I put forth an effort to clean the parts with Ronsonol.  I was not passionate about the clean because the purpose was to validate both disassembly and reassembly.  I am happy to say that everything went off without a hitch.  I even removed the mainspring and found the appropriate mainspring winder among my dad's tools.  No problem.  The hairspring was quite gnarly due to the watch's misadventures among others in the scrapyard!  I did my best to straighten it.  It tic'ed a few strokes when I realized that it was way out of beat.  So, after watching some videos, I rotated the hairspring  until it was close.  It tic'ed a little more, but the hairspring was just not playing along.  That is OK, I accomplished the goal of tear down and rebuild, and I also got to experiment with hairspring adjustments.  No springs, and no screws were lost!!one.png.c06c228e2f93ae66aeca208caf416a11.pngtwo.png.5fb2636194f6d678852ce95e2190f6ba.pngthree.png.ce32e5a559e090afb4845b92ab88d718.pngfour.png.1fa0adb44d51e717335c26e3ec52d438.pngfive.png.d64d5a8bb37d90396d61faf26f3f2fbf.pngsix.png.be34b6e78163ea53330f7fe4e60e7d2d.pngseven.png.18f51c6ea816412fc88fa9e6b7040ac4.pngeight.png.8c3e3ce69293c99e7d995f208eb81be2.pngten.png.624ccbfa26b255aa9be86f4676d90367.pngeleven.png.43a45be94ad4d2b263ba5998705821da.pngtwelve.png.074a2f83a044adf5a6f86a1bf798411c.png

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  • 3 weeks later...

I decided to dedicate some money to a complete restore.  Found a balance complete for a 248 on ebay and purchased it.  Ranfft indicates the 248 is derived from the 48 as is the 51 which I have.  Many parts interchangeable.  We will see.  Next up will be to find a suitable dial and hands.  Seen a few on ebay.  I have a dial, so maybe have it restored...¯\_(ツ)_/¯

Stay tuned!!

As noted originally, this is in part to continue to hone my skills before attacking my Valjoux.

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