Okay, I'll admit to being a bit compulsive, lol! I actually pursued this to the point where I purchased a download of the 1920 Heiser catalog! (Utterly amazing what you can find online!) I believe I've actually found the saddle...looks like the fenders have been replaced, though. Too bad they didn't list prices in the catalog - that would have been interesting to see.

If I'm correct, it's a No. 143-1, Fremont (Extra Fine All Plain Finish Saddle). I'll have to see tomorrow if there's a number stamped anywhere on it.

It's kind of silly, but I've been wanting to ID this saddle since I bought it (before there was internet, lol). If anyone else is interested in the details, I'd be happy to post them. I have full specs from the catalog, and we'll see if they match up.

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Many thanks to MoMoMare for the awesome siggy!