First - thanks to all who have commented. I went into our local jeweler and they were useless in terms of providing advice - I was concerned I would end up having to take a shot in the dark!
This has been very helpful. I agree, the pro is likely the way to go, and you all have convinced me that the engraving on the back is not such a big deal. I think I have decided to go with new. I don't really want to mess with replacement parts etc. This way, it starts with him and any modification/patina over time is his decision and story, and more meaningful when he gives it to our son one day.
So here are my next questions...
1. Thoughts on the crystal caseback? On the one hand, he would likely love and geek out seeing the movement. On the other hand, it's a modification, and is there something to be said for leaving it as is? Looking for the watch nerd perspective here...
2. Is there anything in particular I should look for or consider when purchasing a new Speedy Professional with the manual wind?
3.
@Kringkily has reached out, and I'm open to purchasing through him should he have a fit, but if anyone sees a new one out there, via him or otherwise and wants to throw it up here, I'd love to have the group verify everything looks good - again, big purchase many years in the making, I just want to be sure all looks good.
Thanks to you all again. The husband is going to flip out when he realizes that there was a whole group of fellow watch lovers that helped me work through this!