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Looking for mainspring for Molnia / Molnija 3602, p/n 3379DB

ManSkirtBrew
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ManSkirtBrew Super WRT Addict

ManSkirtBrew

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According to Cousins, this is a discontinued item.

1.30 x .155 x 460 x 13.5 DB End

I've checked on Otto Frei and a few other sites to find something close, but I'm not sure exactly what the "DB special end" is.

MainspringEnds.thumb.jpg.d7c126e3cfcb22d97455a0b2c6026657.jpg

I did find a NOS replacement on eBay, but it costs more than the whole pocketwatch did, so I wanted to see if I could find new replacements first.

Any other favorite suppliers I should be searching?

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mikepilk Distinguished Member

mikepilk

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DB is "double brace", as shown in your pic. There are two prongs which stick out the end, one sits in a slot in the barrel, one in the lid. You could also use DB&H, which is double brace and hole. Just ignore the hole.

Are you sure that's the correct size? 

Ranfft lists the size as 1.85x0.16x400   http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Molnia_3602

In the GR Mainspring database (I downloaded from Cousins) it shows Molnia 3602 as the size you say, but a comment saying it's incorrect, and has a size similar to the Ranfft.  1.85x0.165x400

image.png.8e5a3c8529729f115d775ceb24b35003.png

 

 

Edited by mikepilk
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ManSkirtBrew Super WRT Addict

ManSkirtBrew

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26 minutes ago, mikepilk said:

Are you sure that's the correct size?

I'm not! I was going with the listing Cousins had. I saw that note in the GR database, but thought it was a one-off from someone and figured the Cousins listing would be authoritative.

I'll measure the spring that came out when I get home.

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ManSkirtBrew Super WRT Addict

ManSkirtBrew

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Okay, just measured it. Thickness 0.162mm, height 1.898mm, length 400mm, which agrees with the hand-written note.

Cousins still doesn't list anything of that size, nor does Otto Frei. Unless of course I'm searching wrong, which is highly likely. I also tried a bunch of heights and thicknesses that were close, and didn't come up with anything.

20221007_232103.thumb.jpg.3948a4dfc8cafc1ce50a35fa48ab7234.jpg

image.thumb.png.1caba2a3bde7f017a5f6f6c6b9ee5aaa.png

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mikepilk Distinguished Member

mikepilk

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4 hours ago, ManSkirtBrew said:

Okay, just measured it. Thickness 0.162mm, height 1.898mm, length 400mm, which agrees with the hand-written note.

Cousins still doesn't list anything of that size, nor does Otto Frei. Unless of course I'm searching wrong, which is highly likely. I also tried a bunch of heights and thicknesses that were close, and didn't come up with anything.

You don't have to be exact on the figures - especially thickness and length.

It's so close to 1.9mm you could probably use this one :

image.png.5f972c65f1af76ef0da41f7b15f04ba6.png

 

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