Build date info for 105.012-65

Hello everyone, Please keep in mind I'm new to the watch world so if you think I'm asking entry level questions....maybe I am to you. Also I did reach out to Omega but they where of little help.
I'm trying to work out when my Speedmaster was made. I have a pretty good handle on a few facts but that only leads to more questions. My S/N is 22.829.xxx so I believe that puts it at April/May 1966.
Q1) Why does everyone hide the last three of the S/N? I assume its to stop repo/fakes been made, but how? After all there are only 999 options to chose from and surly the only Speedmasters that anyone would want to forge are the NASA issued watches. Please help me understand what I'm missing?
Q2) What do the three groups of numbers mean? I've read that Speedmasters DONT follow the rest of Omega build/SN lists (sub question, anyone care to share why that is?) I org thought the first two would be a year but I've seen "22" and "24" both made in 1966....so now I don't know which way is up.
Q3) Does anyone know how many Speedmaster where made in 1966?

Here's the bottom line, I'm trying to work out when the NASA 105.012-65 watches where made, I'm thinking it was May-July. I'm also trying to find out when mine was made, I'm thinking April. Then I'm trying to work out how many where made between mine and the first NASA watch. Probably stupid and a little self indulgent but still be nice to know if my watch was getting made the same time as theirs.

hansaboy, thank you, I have used both those sites before and they where very helpful. Lets see if I can upload some pictures. These are what I have from when I bought the watch, best I can do today.

Real time update 😀 I dont know if i just missed some of the options on https://www.ilovemyspeedmaster.com/productiondateprediction/ or if some where added, but ether way it looks like April 1966 was 22.827.319 - 23.030.678 which I guess puts my watch ??? , I still don't understand the Omega number logic. The range between those two numbers is 203,359. Seems like a lot of watches to make in a month..., that's almost 6800 a day. Something is very odd with April and May's S/N as they have a range of 203,359 and 930,384(!!!) so Im guessing Omega skipped over a huge range of numbers? March = 1426, June =1835 and July only 660. Which all seem a lot more believable but still, 1800 a month is still 60 a day! All data from the above site. Can any help me better understand what Omega where up to in April and May 1966 😀 How many did they make?

I’m not sure anybody knows exactly how many were made at a given point. I think there are some overall production numbers for the 321 somewhere in the forum.

However, it is important to note that Omega made watches in batches. This is how I understand it (and others please correct me if I’m wrong). The major guides/resources give a rough serial range, but those weren’t all speedmasters. You’ll see some forum members make a reference like an “april 1966” batch or a “late 1969” batch. Omega may have produced hundreds or thousands of speedmasters in a particular batch. Serials between batches may be for other models—like seamasters or geneves. Over the years, some collectors have surmised rough serial ranges for a particular batch. This data is pieced together through years of research, consulting other experts/collectors, and compiling issued extract data.

Maybe someone will offer if they can lend insight, but this info is not publicly available.

Thanks for this reply. I did think to myself after I submitted that "well they used 321's in other watches" So I know there will be less 105.012-65's then 321 movements. But its still odd (to me) the ranges in numbers. Hopefully someone will share more to help me understand a little better. Ether way looks like my watch was 4-6 weeks before the batch that NASA got, I'm pretty happy with that.

I got the feeling it was "working with what it had" , but better then nothing and it has helped me get my watch down to an April build when I was est April/May.

Yes, we are saying the same thing to each other Dan 😀. I agree its better then nothing but not definitive by any means. For a giggle I went on the Omega website and asked a few questions in the chat. As expected I got noting other that "maybe try the service department as they have access to some historical archives we don't". I'll give them a call in sometime but I'm not going to hold my breath.