You have good questions regarding a purchase of an older used harp that needs major repairs. There’s no way to know how this harp would compare to the new models you mention since it hasn’t undergone its repair yet. Yes, a crack in the baseboard is a major concern.
Can’t say whether the 19 would play the same as the 23 at Eastman, but my feeling is no. One’s a semi-grand and the other a concert grand.
If gold (with carving) is important to you, and you don’t mind a semi-grand then go for it. You can’t buy a new gold for anywhere near that.
You have found a harp that could be a real gem. It will have a warmer, richer tone than any new harp. That said, major repairs are very tricky, and can change a harp. If you are a harp major at Eastman, you should have a concert grand. This would be a good second harp to have. You could sell the Daphne to repair this one if you were also getting a grand. Frankly, I feel that