Congratulations on your purchase! From what I could see from the video, it is a very fine coin indeed.
Proof or prooflike -- this is something many people also have problems with. Sometimes it is impossible to tell, especially with older (pre-1900) coins. For example, in the last N.Y. Sale by Dmitry Markov, an 1854 rouble was advertised as "prooflike or possible proof" (lot #1477). Then there was a 1903 50 kopek coin (extremely rare, only 19 specimens were struck!) It is known that these were struck only in proof, yet the one advertised was designated "prooflike fields, uncirculated" (lot #1584). I had the opportunity to view the coins in Basel in Dec. 2005, and I would tend to agree that it wasn't really a proof, did I not know that it must be a proof because no business strikes were made! It was actually certified in an NGC slab, but the NGC grade didn't make it into the catalogue, and unfortunately I neglected to take note of it since I assumed it would be in the catalogue.

In the book by R.W. Julian he writes:
"Collectors encounter prooflike silver coins, dating from 1844 through the early 1860s, that appear to be proofs but are not." This is because the striking techniques dramatically improved in 1844. If you look at lot #3944 of the recent UBS auction, there is an 1852 rouble advertised as proof. However, the estimate price was for an uncirculated or AU coin (it had some little scratches) since the estimate for a proof should have been much higher. I looked at this coin and decided to bid CHF 750 on it. I thought that if it is indeed a proof, it would go much higher anyway, but I wouldn't win it (I can't afford to buy old proof rouble coins, unfortunately

). And if it weren't a proof, I would win it at a lower price. Unfortunately, it went for CHF 900. Either someone got a real proof coin very cheaply, or else they drastically overpaid for a prooflike coin. I suppose we'll never know.