This Holton trombone mouthpiece can be considered a collector's item. While there are no markings indicating the size other than the manufacturer's stamp, the inner cup diameter measures approximately 25.40mm, suggesting it's similar to a Bach 6-1/2 size. Based on its design, it's likely from the 1960s to 1980s. It appears to be trading on overseas auction sites for $80-$125 (¥12,000 - ¥19,000). For large bore trombones. Total length 8.8cm, 164g. Used. Please check the condition of the item in the photos. #Trombone #Mouthpiece #Holton #Holton #Vintage #Vintage