In 1973 Forrest created a set of chocks named Titons which were made in sizes #1 - 10. In 1975 Forrest created four larger sizes of Titons that were a longer extension to the Titon set. The longer Titons were called Chimney Chocks and had only two holes on them for the webbing. Chimney Chocks were numbered #1 - 6. In 1977 Chimney Chocks were discontinued as Forrest introduced larger Titons that were numbered #9 - 17 all having drilled lightening holes and the largest sizes had three holes for the webbing.
Forrest 1977 catalog photocopy
Forrest August 1975 price list, from Art McCarthy
Forrest Chimney Chocks and Titons
Summit magazine May 1973
Forrest Triton ad, Climbing magazine #92 October 1985 page 18
Forrest Roll Your Own Nut ad, Climbing magazine December 1984 page 51