Factory second pm2 question

[Ztmma]

Hey everyone, im looking to purchase a PM2 m390 or 204p and I wanted to know how I could make sure its not a factory second. Where will I be able to find the marking? Thanks for the help!

 

[NoFair]

If it is a second there should be a notch in the blade on the right side close to the scales (behind the hole) if I remember correctly.

 

[SlippyShayne]

NoFair's right. A quick google search will give you some examples. Also I believe m390 seconds can only be purchased at BB.