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Question on Speedmaster movements

I was just browsing the omega website today since I wanted to understand the speed master line better. While browsing through the various Speedy professionals, I noticed that some use an Omega 1861 movement and others use an Omega 1863 movement. Since I am not very familiar with the speedy line, I have the following questions:

1. What is the difference between the two movements?
2. which one is superior or are they both equally competent?
3. which one was used in the moon watch and which of the speedys qualify as moon watches (display case back with moon watch engraving et al)?
4. why does the broad arrow use a 3303 movement and is it better than the 1861/1863?
5. Which one (broad arrow or pro) is more collectible?

any insights would be highly appreciated.
Thanks

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Question on Speedmaster movements

Re: Question on Speedmaster movements

just a correction

Thank you Keith, very informative *NM*

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0 wallclock secs ( 0.17 usr + 0.03 sys = 0.20 CPU)