..My problem here is that I live in the UK, but there are specialists over here who deal with American coins and I will eventually take it to one of them to verify what I believe is a Dollar with no edge inscription.
The OP's coin is clearly NOT an MS66. I would put a value on it well below the cost of getting it graded which, IMO, would be mid AU. I have no idea what NGC charges for grading error coins but PCGS will charge a $60 Error Coin fee plus a $10 handling fee with a $66.45 return mailing fee. Throw in the mailing costs to the US and we're looking at close to $160 spent on a coin which "might" have a $25 real world value. Of course, if the OP wants the coin authenticated as an unaltered Missing Edge Lettering coin, it could be submitted to ANACS with the understanding that significant mailing fee's will still be incurred for a coin which may have minimal value unless there is a market in the UK for such error's. Then it's up to the OP to decide what he wants to do. Personally, I'd not waste the money to get it graded but I might consider getting it authenticated by contacting Fred Weinberg.
I see what looks like an "N" on the first edge picture. I purchased a no edge lettering presidential dollar on eBay that didn't have good pictures and it turned out to be a circulated coin that most likely was originally a "weak edge lettering" coin. On part of the edge there was no trace of lettering but other areas you could see the remnants of the inscription. I got a refund. This coin may be a "no edge lettering" variety but I'd agree with others that it may not be worth grading. I have a fair number of "raw" error and die variety coins in my collection and I have no intention of getting them slabbed. One is a 1966 SMS no FG Kennedy. They are keepers and not part of an inventory, not for sale, so why spend the money to verify what I already know.