Internet Horology Club 185
SMITHS MKII Mod. 6A/579 8 DAY - Balance STAFF specifications

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October 15, 2018, 10:58
Hugues Martz
SMITHS MKII Mod. 6A/579 8 DAY - Balance STAFF specifications
I have a 8 day SMITH 6A/579 8 DAY cockpit clock (1940) with unfortunately (and it is common) a broken balance staff.
Maybe someone was already facing this problem.
Someone would tell me if there is a reference RONDA or BEST FIT the closest to reassemble it?
Or, maybe someone knows where one can find equivalent balance regulated.
Thanks in advance for your help,
October 15, 2018, 12:44
Melvin Siedman
Bestfit # for a "Smith 8 day clock" is 100/1871
Rare bird.
Bestfit dimensions only give, overall as 760 and the balance diameter as 100
October 15, 2018, 18:03
Bila Wirriganwalters
Do you have a picture of the movement?
October 16, 2018, 02:23
Hugues Martz
Here is a photo of the movement

October 16, 2018, 02:36
Hugues Martz
Hi Melvin,
Thank you for your quick reply. I do not think that's the right direction. Indeed in the Bestfit part. 1, the N ° 1871 is mentioned for the 8 DAY SMITHS but the reference to the descriptive page of the movement does not give the good image (page 361). it looks more like a wall clock movement than an aircraft movement clock
By the way, the broken axis measures 590 (100th of MM) which could give unbroken around 630
October 16, 2018, 03:33
Bila Wirriganwalters
Can you give me a view of the dial side, that model Smith's carried a Jaeger Lecoutre movement in a lot of cases although they weren't marked as such?
October 16, 2018, 04:01
Bila Wirriganwalters
It is a Smith's Mk II, they used an unmarked LeCoultre 7 Jewel Caliber 201 movement that is a bezel wind type, same movement that LeCoultre used in their "model 201" 19 lignes.

Dimensions:- Overall 6.48mm long, balance seat diameter 1.10mm, hairspring seat .72mm, roller table seat .62mm
October 16, 2018, 04:19
Hugues Martz
A very big thank you Bila for this very precise return. This should help me greatly to repair this clock.
Do you still want a picture of the other side of the clock?
October 16, 2018, 05:09
Bila Wirriganwalters
No Hugues I will not need the photo, thank you. Glad I could help you outSmile
October 17, 2018, 17:33
Greg Crockett
By the way, Hugues Martz, welcome to the forum! I hope you will post an image of the clock when you are done restoring it.

I see you are in Paris, France. Are you also a member of forum-a-montres (FAM)?
October 18, 2018, 02:52
Hugues Martz
Hello Greg,
Of course I will post a photo once the restoration completed.
No, I do not know FAM but I will go see.