USMC Raider Patch

[Wft2180]

Hello, I am new to this sort of thing and I was wondering if anyone could help me determine if this patch id authentic or not. 
 

Respectfully, Will

[KurtA]

It’s unfortunately a repro.   Synthetic threads 

[Wft2180]

Thankyou Sir, I appreciate the insight, 

[Wft2180]

Just now, KurtA said:

It’s unfortunately a repro.   Synthetic threads 

May I ask how you can tell?

[KurtA]

10 hours ago, Wft2180 said:

May I ask how you can tell?

The key is the reverse threading.  Should be flat white “cotton”.   This example  has silvery thin translucent synthetic thread. It takes time to learn this. Best to compare patches in hand.   A black light can be very beneficial.   Synthetic threads  glow. 
Also, note the poorly trimmed khaki edging with loose threads. A WW2 era patch will not have this.  

[Wft2180]

Thankyou, much appreciated