Anyone know the spine of Herter's Farbenglass-f arrows?  Thanks

I do.

They are 40-50 depending on 28" 29" draw.

Thanks Ron

From the Herter's charts:  F arrows are as follows:
24"    65-70#
25"    60-64#
26"    55-59#
27"    50-54#
28"    45-49#
29"    40-44#
30"    35-39#
31"    30-34#

Stinger, Thats an interesting chart, Do you have information on Herters g,h and j farbenglas arrows.

Chart works the same way for all shafts. spine in relation to draw length. The Farbenglas are actually;
G  H  I  J
Each size is the next 5# up- example: G is 50-54# @28

Thanks Raghorn

In what year/years were the farbenglas and MJ LOG shafts introduced? Late 50s? Mid 60s?

Trap

Bear Glas came out in 1957 and then in 1960 Bear introduced the Micro Flite. So I would say at some point after that the other glass shafts appeared. I see Gordon shafts in a 1973 catalog.