1in or 1&1/8th?
some good choices around that time with various sizes available
s&m pitchforks/ditchforks/stupid fork, 1in/1in clamp on/1&1/8th ahead
hoffman superforks 1in/1in clamp on/1&1/8th ahead
zima 1in
standard bash forks 1in/1in clamp on/1&1/8th ahead