Hi, I need some advice on a Lee Speed Patent.

Can any of you help me determine exactly what it is and how much it may be worth?

The mag cut off is missing and the original front sights have been changed at some point.
I would like to find these two parts if poss.

Serial number is 3 digits all over the gun.
Theres a letter and two numbers under the bolt head on the receiver.

Thanks in advance for any help you may bring.

edit. my pictures wont show. Ill try later.