Modding My 1861 Speedmaster With 321 145.012 Service Dial

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tl;dr I sourced a 321 Professional service dial on eBay. I found a local watchmaker and he installed it in my 1861 (Big Box) Speedmaster. I am extremely happy with the result.

After much research on this forum and other spots I determined I wanted to try this mod, putting a 321 service dial (specifically one for the professional 145.012 models) in my 1861. What I gathered about the mod was this: it will fit, but a watchmaker has to shorten the legs on the 321 dial and shave the legs' diameter a bit as well.

I shot from the hip and bought a dial that I found on eBay in Switzerland. The back of the dial is engraved with the number PP2001002A, like this one that was being sold here for $300 back in 2017 (I paid triple that). I had a local watchmaker in mind to do the work who had done a service on my dad's vintage Rolex, but after I bought the dial and asked him, he is now too busy with his business venture (shout out Cincinnati Watch Co) for outside repair work. So I asked some others and discovered another roadblock I was unaware of: That any Omega-certified watchmaker is forbidden from performing mods like this. So my excellent local AD watchmaker said he couldn't do it.

I despaired a little bit but then reached out to the AWCI (which happens to be HQ'd here in Cincinnati), who referred me to an independent watchmaker about 1 hour drive from me, who they felt was of excellent caliber and could do the work. I called him, he said he'd look at it, I drove out, and dropped it off. He did the work and when I picked it up, I recorded this video of him explaining it a bit:


Very pleased with the result. It's a delight to me every time I wear it and look at the time.


 
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That is super cool, I just got mine Speedmaster (2nd hand, but it was our anniversary present from my wife <3), the watch is an older model, post 1999. Have some minor scratches (I cleaned up with polywatch) now I'm just trying to clean up some minor dings on the tachymeter and thinking I may watch to swap out the hands as the minute hand is loosing some of the lum...just not sure if I should try to take it to a watchsmith or send it in for service? Curious about your thoughts since you obviously know a lot about these watches... Thanks in advance
 
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tl;dr I sourced a 321 Professional service dial on eBay. I found a local watchmaker and he installed it in my 1861 (Big Box) Speedmaster. I am extremely happy with the result.

After much research on this forum and other spots I determined I wanted to try this mod, putting a 321 service dial (specifically one for the professional 145.012 models) in my 1861. What I gathered about the mod was this: it will fit, but a watchmaker has to shorten the legs on the 321 dial and shave the legs' diameter a bit as well.

I shot from the hip and bought a dial that I found on eBay in Switzerland. The back of the dial is engraved with the number PP2001002A, like this one that was being sold here for $300 back in 2017 (I paid triple that). I had a local watchmaker in mind to do the work who had done a service on my dad's vintage Rolex, but after I bought the dial and asked him, he is now too busy with his business venture (shout out Cincinnati Watch Co) for outside repair work. So I asked some others and discovered another roadblock I was unaware of: That any Omega-certified watchmaker is forbidden from performing mods like this. So my excellent local AD watchmaker said he couldn't do it.

I despaired a little bit but then reached out to the AWCI (which happens to be HQ'd here in Cincinnati), who referred me to an independent watchmaker about 1 hour drive from me, who they felt was of excellent caliber and could do the work. I called him, he said he'd look at it, I drove out, and dropped it off. He did the work and when I picked it up, I recorded this video of him explaining it a bit:


Very pleased with the result. It's a delight to me every time I wear it and look at the time.



Great mod & I’ve watched this video on YouTube and a few you done before with the difference on the cases between the 1861 & 3861. Must say it’s almost perfect just wish the 3861 movement and sapphire back was available.

Wonder if the subtle differences on the lyre lugs (viewed from top) could be done to the 3861 as it was on the 1861.