Before the seamless Champion and Phonics, that was a D421. SONOR didn`t make any student drums without a bead in the teardrop era.
SONOR stopped using the two hole hoop before they made that throw. It was on the budget 70`s line.
Thanks Oddball...
This drum has a bead and I bought it this way back in '71. I don't know what that makes it but thought I remember being told it was a student model.