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yasser · 19 May 2011, 07:04 PM

Hi Guys ,

I swap balance wheel 1520 and 1570 and I was surprised it worked even the the bridges are the same I noticed the only difference is the hair spring and screws on the 1570 balance Are they identical acutualy?

Thanks

timehonored · 25 May 2011, 10:52 AM

HI Yasser,
The base caliber for a 1570 (19,800) VPH is a 1530. The balance wheel on a 1520 Oscillates at 18,000 VPH. They are not comparable in standard form, and the watch will run incorrectly.
Good Luck.

yasser · 25 May 2011, 06:43 PM

Hi timehonored ,
Yeah I agree with you the base for both cal 1520 and 1570 is 1530 but also both 1520 and 1570 running at 19.800 and 1530 cal running at 18000 VPH
Thanks
Yasser

timehonored · 26 May 2011, 06:57 AM

I stand corrected Yasser. That said, the part number for a 1520 Balance is 8055 and the part number for the 1570 balance 8106. The 1520s I've worked on were in Non-chronometer watches. Why not replace it with the correct balance though? It is still available from Rolex.
Regards-
Time Honored

timehonored · 26 May 2011, 07:38 AM

Hi Yasser,
You moved me to action and I opened a 5513 (1520) Submariner and a 1680 (1570) Submariner to compare both balances. The 1520 has regulating pins while the 1570 is free sprung with microstella screws. The 1520 is also a Flat Hairspring while the 1570 is a Breguet Overcoil hairspring. The 1570 is of much higher quality. . .

yasser · 26 May 2011, 07:56 AM

VPH the same for both and staff balance the same so it works even I measure the timing big difference so the bottom line if you want 1520 to become chronometere just change the balance to 1570

19 May 2011, 07:04 PM	#1
yasser "TRF" Member Join Date: Nov 2007 Location: Saudi Arabia Posts: 10	1520 and 1570 rolex balance wheel Hi Guys , I swap balance wheel 1520 and 1570 and I was surprised it worked even the the bridges are the same I noticed the only difference is the hair spring and screws on the 1570 balance Are they identical acutualy? Thanks

26 May 2011, 07:56 AM	#6
yasser "TRF" Member Join Date: Nov 2007 Location: Saudi Arabia Posts: 10	This is the trick of Rolex the staff balance is the same VPH the same for both and staff balance the same so it works even I measure the timing big difference so the bottom line if you want 1520 to become chronometere just change the balance to 1570

25 May 2011, 10:52 AM	#2
timehonored "TRF" Member Join Date: May 2011 Real Name: Doug Location: SFO-HNL-SLC Watch: Z-Blue Milgauss Posts: 80	HI Yasser, The base caliber for a 1570 (19,800) VPH is a 1530. The balance wheel on a 1520 Oscillates at 18,000 VPH. They are not comparable in standard form, and the watch will run incorrectly. Good Luck.

25 May 2011, 06:43 PM	#3
yasser "TRF" Member Join Date: Nov 2007 Location: Saudi Arabia Posts: 10	Hi timehonored , Yeah I agree with you the base for both cal 1520 and 1570 is 1530 but also both 1520 and 1570 running at 19.800 and 1530 cal running at 18000 VPH Thanks Yasser

26 May 2011, 06:57 AM	#4
timehonored "TRF" Member Join Date: May 2011 Real Name: Doug Location: SFO-HNL-SLC Watch: Z-Blue Milgauss Posts: 80	I stand corrected Yasser. That said, the part number for a 1520 Balance is 8055 and the part number for the 1570 balance 8106. The 1520s I've worked on were in Non-chronometer watches. Why not replace it with the correct balance though? It is still available from Rolex. Regards- Time Honored

26 May 2011, 07:38 AM	#5
timehonored "TRF" Member Join Date: May 2011 Real Name: Doug Location: SFO-HNL-SLC Watch: Z-Blue Milgauss Posts: 80	Hi Yasser, You moved me to action and I opened a 5513 (1520) Submariner and a 1680 (1570) Submariner to compare both balances. The 1520 has regulating pins while the 1570 is free sprung with microstella screws. The 1520 is also a Flat Hairspring while the 1570 is a Breguet Overcoil hairspring. The 1570 is of much higher quality. . .

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