Looking for wood Casement R.O.W. crank handles

A handy person from SC says:
April 11, 2011
I am searching for replacement crank handles for wood casement windows. Unable to find manufacturer name on window frame or metal hardware. Each handle has the letters R.O.W inscribed on it. They are 4" die cast (2) piece metal with a set screw at the 3/8" opening.
Home was custom built in 1980.
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Mike from SWISCO responded:
April 11, 2011
Good Morning,

Thanks for contacting us. Can you submit a couple pictures of your cranks for us to look at?
A handy person from SC says:
April 11, 2011
Mike thanks for the reply!
I will forward a few images from different angles?
Michael S.
User submitted photo of their R.O.W. crank handle.
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Mike from SWISCO responded:
April 11, 2011
Your crank handle looks like the SWISCO 39-104 replacement crank handle, but you are going to need to match up the spline of your crank handle to the replacement crank handle to be sure.

For example, the spline of the 39-104 measures 3/8" and looks like this:
Close up of the gear hole of the 39-104 window operator crank handle.
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