maybe someone can solve a riddle: who is ITB?

years ago I found this little salt spoon, St. Petersburg, maker ITB. I always thought that the funny form comes from an unprofessional repair. The maker ITB = Buntzell, Johann Theodor??????
What a surprise, when I found some years later an identic salt spoon, Riga, maker Jacobi, Friedrich W. So this form actual existed.


Thanks in advance
Goldstein