Thanks again Raimey, I was unable to get the pics done last night and posted. I will get them on today and look for markings noted in your reply. I don't recall the Nitro stamps but will verify. I will try the soap method and clarify the proof date also. Again thank you for your help!

The gun does have an automatic pop-up sight, crossbolt, not sure about sideclips? Will update OP with a few other pictures today!