Here we go:
So, in comparison with your 15/16' and 3' 11/32 long edge (8.5 cm), here are some of mine:
Attachment 235093
From above to below:
"France" (1780-1790): 3 2/8' (8,25cm)
"S:Norris" (1770-1790): 3 1/16' (7,78cm)
Unknown: 3 1/8' (7,9cm)
"Limrick" (John Hall, Sharrow Moor, Sheffield, around 1790-1795): 2 15/16' (7,46cm)
Attachment 235094
From above to below:
Unknown: 3' (7,62cm)
Unknown: 3 2/8' (8,25cm)
"*P" (John Fox) (I guess 1760-1770): 3' (7,62cm)
Attachment 235095
An extra picture of the John Fox (this razor is already known by you :p)
http://straightrazorpalace.com/razor...or-inside.html
http://straightrazorpalace.com/razor...king-info.html
Attachment 235096
From above to below:
"+SMITH" (1760-1770): 3 5/8' (9,2cm)
"+SMITH" (1760-1770, restored, grounded, probably in the 19th century): 3 9/16' (9cm)
(both "+SMITH"'s are also recognizable for you
http://straightrazorpalace.com/razor...or-inside.html
http://straightrazorpalace.com/razor...rge-smith.html)
"crown WOLF" (around 1790?): 3' (7,62cm)
"+GB" (around 1790?): 3 1/8' (7,9cm)
So, my oldest ones (2 "+SMITH"'s, 1760-1770) do have the longest edge (3 5/8' (9,2cm) & 3 9/16' (9cm)),
BUT the "*P" (John Fox), of which I guess is from 1760-1770 as well, has a shorter edge of 3' (7,62cm)
:hmmm: