The new multi-faceted models were identified by the digit 10 (resulting in a 4-digit code) while the smooth version were identified by the digit 9. The use of celluloid was presumably indicated by the digit 4 in the column of tens, even if there are model with the digit 5. The details on the numbering of this period are therefore somewhat uncertain. | The new multi-faceted models were identified by the digit 10 (resulting in a 4-digit code) while the smooth version were identified by the digit 9. The use of celluloid was presumably indicated by the digit 4 in the column of tens, even if there are model with the digit 5. The details on the numbering of this period are therefore somewhat uncertain. |