It's from June 1997 so if in Real Life it's lighter than Navy it could have been Blue and considered as one of the Fall bags. Or maybe it was Navy, it's sitting right on the Seasons border. Blues are a beetch to photograph and I've seen as many as three different shades of blue in a set of 10 or 12 photos for the same bag. I know that Sapphire sounds a lot more exciting than Blue but that's
Coach's naming decision, not mine. Coach's vintage "Blue" is like their vintage "Red", it covers a lot of different shades.
As for purple-ish blues, there was a very dark purple with blue tones (or vice-versa) called Ink and available in the Tribeca line but that didn't come out until some time in 1998 and the Tribeca Ink color wasn't shared with other lines from what I've seen.
Purple shades and even colors with purple overtones have always been scarce with Coach until about the last 15 years. Believe me, I've looked at, and often bought, anything from Coach that even showed a hint of being Purple and have almost always been disappointed. Even with purples becoming more available since the Great Escape (aka the move to China) I still have more purple Kiplings than Coaches. And I LOOOOOOVE purple handbags!