King 55TUB Silver Flair Trumpet Upturned Bell

The makers say

King 55TUB Silver Flair Trumpet Upturned Bell

462(11.73mm) bore, 4-7/8(124mm)
upturned bell, Monel pistons, 1st slide trigger, 3rd slide with
adjustable stop, bright silver plate, 3C mouthpiece, deluxe woodshell case