I just found some more markings. It's one line that runs down between the two barrels on top, just above the steel stamps. It looks to me like it says " K. SRBA, HEIDELBERG - MANNHEIM.
https://drive.google.com/file/d/1Bt2r_iUj0MNtpwhu8qRggkjWycBJhfVQ/view?usp=drivesdk
https://drive.google.com/file/d/1BmuOJ7Exy7vV92AYxw6-69EeqiU1JUo-/view?usp=drivesdk


Shannon S Young