Barcalo is probably out of business but I remember seeing a lot of wrenches
made by them 50-55 years ago. I'd guess their heyday was the first half of
the 20th century, before the Asians got their act together. I'm pretty
sure they were in Buffalo, New York.

Real Volvo manifolds are held on by 5/16" bolts whose heads and nuts have
a 1/2" hex. I believe that my starters are mounted with 7/16" bolts that
have 5/8" hex on the head and 11/16" hex on the nuts.

I'd be interested in the measurements of the span of the ends of the wrench,
whether the 5/16" end is indeed 5/16" or 1/2", etc.
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma