I know what it is. But what is it and who made it??? 17" - 1/2 x 9/16" Open End

[UncleBill]

This one is another mystery to me because I can't find another like it on eBay and or Google.  By the way it was made I am thinking 1920's.  No marks. Came from a house that also had very early 1920's wrenches and tools up to 1950's.  Looks like he also was a brake mechanic.  Lots of brake tools. No other one like it in any size at house.

Here is what I know.  1/2" x 9/16" open end.  17" long x 3/16" thick.  Handle consistently 19/32" wide. Weighs 10 oz. exactly,

[turnnut]

   ??? tappet adjusting wrench  ???

[Plyerman]

Wow. You would need some real wide open access to swing a wrench that long.

[bill300d]

Probably a Tappet wrench for adjusting valves. Most were thin and long just like that. Brand-no idea. Age would somewhere between early 1940's and mid 70's I would think..

[leg17]

Pretty thick for automotive tappets.

[Papaw]

Possibly an early brake tool.

[UncleBill]

I just measured the thickness to 3 different tappet wrenches. Herbrand, Duro-Chrome and a Chrome Molybdenum and the thickness of the wrench is twice of all the tappet wrenches.

[strik9]

It would make an excellent bike pedal wrench.   Mine is about the same in all but the length.

   Mine is about a foot long and made in Europe, I have to look to see where.
    Any other tools that look strangely useful on an old Schwinn or Raleigh?   You might have a bike shop box.

[UncleBill]

Never thought of it being used for a bike...   But I just checked it on my cruiser and it does clear the tire top so you wouldn't hit the spokes or the tire.  But I only have a new cruiser and not sure what size nuts where used on the old bikes.

[strik9]

It would be used to remove the pedals of the bike.      Newer bikes will be 15mm at the pedal.

   They are usually in there tight and the extra long wrench made it easier to get them loose.  There isn't always a wide gap between the pedal and the cramk arm.  That is why they are thinner.