Geometric die head unknown model and style

[metalrodholders]

I have attached a picture of a die head but am unsure of what style this is.

Does anyone know what this is? I jumped on it due to price before I read up on them.

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[metalrodholders]

A little more info that I hope will help

The shaft is 5/8" od 3/8" Id and that block that holds the chasers are 3/8" wide. The slot in the bottom of the chaser is slanted I can't tell if this is just the standard D style or not.