As mentioned, it is a great looking horn and any heavily engraved gold plated horn is "wanted" however being a Holton hurts as it seems everyone is afraid of Holtons, Yorks, etc. I agree that you should keep it as it IS rare and really not a high value horn.
As to the tuner,; Holton used these on the Rudys in the late 20s and continued using them after the Rudy stopped. I think that would make your horn more of a mid 30s alto.
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