T&T: anchor chain

[StWillett at aol.com]

I will be buying a new windlass soon. I am not quite sure of  the 
nomenclature of the chain I am using now.
I measured the links with a dial caliper and found the following
     
 
The specifications of my chain are:
Wire diameter  .35 inch
inside measurement of link, long way    1.02 inch
outside measurement of link, long way   1.68 inch
outside measurement of link, across        1.15 inch
 
the chain links are stamped G4
 
I measured some drill bits with the same caliper and found
a 5/16" bit shows as .32" on the caliper dial
 a 3/8" bit shows as .375 
    The chain seems to be somewhere in between, maybe a  metric size, the 
chain was working well on my previous windlass  (S&L Sprint 1000) gypsy but I 
don't know that gypsy size and can't find the  original specs in the 
previous owners paperwork. 
    I want to be sure to have the correct information to  order the new 
windlass, does anyone know what it would be based on these  specs?
Thanks 
Steve Willett
Monk 36, Gumbo
Thibodaux, Louisiana

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