Need help identifying a 30-06 stripper clip

I a box of my old goodies from the late 1950s, I found a brass stripper clip with a steel spring marked "P 25". It had five commercial 30-06 rounds in it I also found a 30-06 round marked F A over 41 (Frankford Arsenal I assume). Just wondering if there is a list of clip manufacturers and the markings?

I could not find any markings on my brass or steel clips. I did find a steel clip marked SEY which could be for 7.62mm

My brass one doesn't have a mark either. I had scads of them and don't remember ANY marks. Could you post a pic? That'll iron it out.