Originally Posted by Kutter
I wonder why the trigger guard tang was left so plain.

I thumbed through all the NID pictures in my files and a single line around the serial number is the "standard" on the No. 5E trigger guard strap. Up into the high 45xxxx range it is a long U like the OP's gun and on the higher serial number guns it is a long O.

The single selective trigger is sometimes checkered and sometimes not. The triggers are checkered on the only double trigger No. 5E I have pictures of.