Well, if Buescher hadn't gone out of business in 1963, there might be. Unfortunately, there isn't, and it's a matter of gathering subjective opinions based on a number of factors including the condition of the engraving -- so here's mine.
Given the clarity of the serial number stamping and the complete lack of silver embedded in the recesses, I'd say it was a bare brass horn to start with, and the lacquered post production at least once in its life.
Others may differ, but it seems likely.
1926 Buescher Model 122 True Tone Series III Gold Plated Soprano -- Morgan Vintage 6
1936 Buescher Model 139 Custom Built Bare Brass Baritone -- Strathon 8*
1938 Buescher Model 139 Aristocrat Gold Plated Baritone -- Strathon 8*
1939 Buescher Model 135 Aristocrat Silver Plated Series I Alto -- Ishimori Traditional Jazz 7, TW Durga 8
1947 Buescher Model B-11 400 (Top Hat & Cane) Bare Brass Tenor -- TW Durga 8
1949 Buescher Model B-7 400 (Top Hat & Cane) Silver Alto -- Ishimori Traditional Jazz 7
1949 Buescher Model 140 Aristocrat (Big B) Lacquer Alto -- Ishimori Traditional Jazz 7
1949 Buescher Model 156 Aristocrat (Big B) Gold Plated Tenor -- TW Durga 8
1970 something Yamaha Model YBS-61 Baritone -- TW Durga 8
Nothing works so well in gathering information as a display of ignorance. I've been learning a lot lately.
That makes sense madden