https://www.purplewave.com/auction/231017/item/MH9325/Surveying_and_GPS-Surveying_Equip.-Missouri
Current high bid is $22.50.
They're short a chain and a set of pins.
I found something similar on a different auction site last night. The listing says Antique Surveying Depth Sticks. Two very old Philly rods. At first I thought I might be expecting to see a couple of sticks that were used at gas stations to measure the depth of fuel in underground tanks.
I have the chain pins. Little over 3 sets. Carry loop and all. I just need my license and a strong magnifying glass to read the verniers with. Have 300 ft steel tape add version. I could start working asap lol. I use one of my steel tapes to layout paddocks on the farm.