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Hi Guys, I find the etachron balance to be a great design (with great accuracy) if factory set!! Having a rotatable block allowing regulator pins to move in unison definitely beats the bending of regulator pins of other systems, especially for isochronism ! Pity that genuine balance wheels do not come out already complete with bridge bing already factory adjusted, so I picked up a ew balance to replace in my bridge which went well snapping in stud into stud holder etc! etc! Hairspring was a breeze and intact! Followed all the protocols of opening regulator block with pins at their widest opening with micro adjuster in centre! Well in beat wit( beat error of 0.4ms! I thought - Great all is smooth! Wrong! Timing is +6 secs/day dial up, +8 secs/day with bottom lugs down, which is close BUT +20 secs/day crown up and -8 secs/day crown down which is way off to me! I recall this as “out of positional rate”. I am thinking that these things are not as easy to adjust even though all the hardware replacement went well. I am wondering if anyone who has ever replaced a balance with hairspring has ever had this issue? I am concerned that I may fix timing in these positions and screw up the other positions ending up with same problem in opposite directions! thanks for any suggestions and comments!

Timing them is tricky. The brass piece on the bridge lever also adjust the speed. Turn right or left to find consistent speed in all positions. Then move that same lever in or out to speed it up or slow it down. Be sure your amplitude is sufficient before you do anything. It could take an hour or longer to time it. I assume you have a time graph and are not using kelo Good luck

Yes the balances come with the hairspring as one piece ( but not with the bridge) which I picked up from a seller in .France for USD35d delivered which was in genuine eta packet! I just wished they came already attached to the balance bridge ( or balance kock) already calibrated! The hardest part is getting the brass block at the right orientation so that the hairspring breathes between the pins, but before that you need to get hairspring dead centre in the regulator pins when snapping stud into stud arm. If you don’t you get insane positional variation and no chance of regulation! You will be chasing your tail endlessly! To get it right you really need a special tool to do this with some hour hand on the tool as a visual guide so you can see how far you turn it! Not for the faint hearted! If it came like the generic ones as a complete bridge and balance/hairspring, one could avoid this headache! I saw a complete genuine bridge and balance for a Breitling in a yellow casing which the wanted USD85. For a extra 40 dollars you can get a complete genuine movement! To answer your question, it is a. Eta 2824-2! When they are factory timed, the accuracy is amazing almost chronometer standard

Did you overhaul the movement (including pegging all of the jewels) before replacement? It sounds like you have a gummy or worn cap jewel that is affecting timing when the balance is running on that jewel.