HarryHeart
·The 552 was a common movement with a few other models. Only an extract can tell you if that movement came in an SM300- but is that important to you? The one you posted doesn’t look cobbled to me, in fact is looks like it was a well cared for watch that had a very well done dial relume. The question for you is what are your goals? Do you want a flawless shelf piece or do you want a nice piece to wear daily? Also- the price of the one you posted would be a big deciding factor. If they want collectible value- then pass and hold out for a collectible one. But if it’s priced fairly- I would wear it regularly.
I looked everywhere but couldn’t find anything like the price chart from speedmaster101 but for SM300s. I mean besides eBay or Chrono24 where I suppose to find much „fantasy“. Is there any possibility how to come to an estimation bandwidth for a „fair“ price to this watch - assumed that the movement is not original, dial and hands are relumed, bezel is a newer original and everything else is correct? Anybody here who would try a rough estimate?