Hi Sid,
Yes, the catalogs were fascinating! Thank you for that wonderful advice. I couldn’t find a catalog for the exact year in question, but near enough. The details on my harp are not exactly like either the style 21 or the style 17 shown, but they are much nearer to the 17. So I am going to assume that’s what I’ve got — a very old (1918) style 17, which is considerably smaller than a modern semi-grand. L&H tells me this was only the second style 17 they made. So that’s pretty special.