MO4 (after 1979). Manufacturers often replace old Part Numbers with new ones, as they launch new products in the market. ISO STD 6621-3:1990 andDIN 70909.
INOOMP 5 Pcs Trumpet Piston Springs Set for B♭ Trumpet, Silver Valve Button Components, Compact Brass Instrument Repair Parts for Band and Orchestra Use
Luxshiny Trumpet Lightweight and Easy to Install 30pcs Noise Reduction Accessories Rubber Rings Portable Trumpet Slide Ring Set for Performance and Practice for Musicians
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Black Curved Bottom Humbucker Pickup Mounting Ring Set for Epiphone Guitars by VINTAGE FORGE | HR1800C-BLK
