Glad you got it. The black tube is a steel blast shield. The aluminum tubes are the primer feed tubes.
I started on a 450 that a friend had been using since 1980-something. He was moving to Germany for a job opportunity in...I don't recall, maybe 2005? I had been talking about reloading for a while, had been picking up my brass at the range (and buying some once-fired as well) and even buying 1000 primers here and there.
When Bob out shipped for Germany he sent me a surprise package, consisting of his 450, scale, calipers, couple reloading manuals...
I started out just de-priming and sizing a bunch of cases. That done, I used the press as a fancy single-stage. One case, seat a primer, rotate the shell plate, drop the powder, rotate the shell plate, seat a bullet. Three or four pulls of the handle, one loaded round.
Once I was a little bit more confident, I started using it as designed. At a fairly relaxed rate, I was doing 150 rounds per hour.
I used it for about two years, at which point Bob returned to the US. It was Christmas time. I boxed up his 450 and everything that came with it and sent it back. I had already bought newer manuals, a digital scale, digital calipers...so on and so forth.
On Christmas Day, there was a large box under the tree with my name on it, from my loving wife. It was a new Dillon 550.
Bob is still using his 450, and I expect he will be for quite some time.
I ran across another 550 at a gun show a couple years ago. Think I paid $250 for it. It was missing a bunch of parts--Dillon was really good about helping me get it back together. Although I told them that the parts were lost, not broken, I think they charged me about 1/2 what the total should have been. I set it up for SPP (my other for LPP) but ended up selling it to a friend for what I had in it. He got a good deal, and now we split powder, primer, bullet orders.
I ran across a 450 about a bit over a year ago, bought it (maybe $200) and sold it again at my cost to a co-worker. He let it sit around forever... I kept asking him if he was reloading yet.
It took the ammo shortage for him to order some parts--naturally, that took a while, but now he is grinning and shooting.
The only thing I would recommend is the auto-prime and maybe the auto powder drop. You can do each as money becomes available, but both make the process far simpler.
With the 450, you need to feed a case, operate the primer knob, operate the powder drop knob, and hand-seat a bullet....and move the lever.
With the 550-style primer and bullet feeds, you insert a case, insert a bullet, move the lever.
With the 550, I do 200-225 rounds per hour. I am quite happy with that.
I know that others do twice that number. It's not a race. I want to pay attention to each step, stop and measure powder throw weight every now and then, measure OAL every now and then, drop each loaded round into the case gauge.
Enjoy your Dillon. If they cannot provide a 450 manual, the 550 manual will cover 90%+ of the operation and parts. Keep an eye open, and you will find one somewhere--maybe post and ask someone with a 450 to make a photocopy of their manual.