I see the 50th Anniv. gun quite a lot. When it's priced around $700, it sells. I see the same gun at the same table show after show when it has a $1000 price tag.
As for the 27-2 engraved, provenance dictates the price. If it's factory, it's worth more. Maybe the same if the engraver is well known. I was wondering if you were told it might be/might not be over the phone or in a factory letter.