Production date help

[unitedcs]

I read a post somewhere on here when I searched bakelit. The only thing I'm sure of is serial numbers match, it's a 7.65 and the grips are of a brown material not wood. Could possibly be plastic but from reading here, the plastic grips were black. Thy look to be period to the gun because of the condition. The diamond pattern is nearly worn smooth on the right grip and look to have never been removed. There is nothing on top other than the DWM logo.