The Hayes SmartModem 1200B from 1983/84   

Specifications: 

Baud Rates: 110, 300, and 1200 baud 

Modulation: Bell 103 and Bell 212A 

Interface: RS-232C 

Power Supply: External power adapter 

Features: 

Autodial and autoanswer capabilities 

Command set compatible with the Hayes AT command set 

LED indicators for status monitoring 

Dimensions: Approximately 8.5 x 6.5 x 2 inches 

Weight: Around 2 pounds 

This modem was quite advanced for its time, offering reliable connectivity for early personal computers.