Keuffel and Esser 4055
Keuffel and Esser Model 4055 "Favorite"
- Type: Closed Body Enhanced Mannheim
- Size: 10 Inches / 25 cm
- Material: Mahogany and celluloid
- Front: A [ B C ] D
- Back: [ S L T ]
- HvH: 4147
Unit conversions and materials properties on reverse. Serial number 056537.
The serial number suggests a date of manufacture around 1925, but the cursor on this unit wasn't manufactured until 1933. Probably a replacement cursor.