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This Yamaha ybb321 sold for $713.42 a few days ago. I have the Holton version also.

http://cgi.ebay.com/Yamaha-YBB321-4-Val ... dZViewItem

I would add more for better lacquer condition. Also I've been told that since this model is primarily for schools, a hard case adds a lot more value; a soft case adds a little more value.

I would guesstimate the value of a Yamaha 321 or Holton stencil in very good condition at between $1000-$2000, while the value of the marching horn is between $750-$1250. Condition has a large impact on these values, and these are retail value, or what they would sell for used in a music store.