Hi Dwight,
Unfortunately, it was dark by the time I got home from work last night and it's raining today, so I couldn't get any good photos outside. I tried to improvise the best I could with light, but I'm not very happy with all of the photos.
Below are the pictures I was able to get. I'll try to describe each of the markings the best that I can:
On the top of the receiver: Below the Artillery notch, is "1920", then under it, is the date "1918".
Left side of the barrel: Crown over "RC". Under, or two the right, is a marking that I can't make out. It almost looks like a gothic letter "B".
Bottom of the barrel: Serial number 3173, which matches the receiver and the extractor.
Right Side of receiver: The marking on the left looks like a crown over a bomb and to the right of it, is the german waffle mark with letters/numbers under it that I can't make out.
Bottom side of receiver (looking at it with the barrel pointing down): On the Lug, is the letter "P" and slightly above it and to the left is the letter "N" with a circle around it.
I see multiple other marking including: the number "3" below the lug turned on side, upside down letter "L", upside down triangle or letter "V". To the right of the lug looks like a bomb.
To the left of the lug is a marking I can't describe as it doesn't resemble a letter or a number. Above that marking looks like a very faint letter "M".
Please let me know your thoughts. Thanks again!!