Vintage Martin Adjustable Pin Spanner Wrench 0471A
A quick search shows these are very expensive tools!
Made in USA
Pin does not look worn out.
Came with a job lot of tools
Info below copied, it might be of use but please check all details with pictures to make sure its what you require or please ask if you need more info
Martin Pin Spanner Wrench,
Adjustable SAE, Series: BD11, 3/4 to 2 in Capacity, 6-1/2 in Overall
Length, 3/16 in Pin Diameter, 5/32 in Pin Length, Flat Handle, 1/4 in
Handle, Forged Alloy Steel, Industrial Black
Adjustable pin spanner wrenches are drop forged steel handles and have steel jaws
These wrenches cover several nut sizes
The pins fit into the holes or slots on the side of the flange or collar
Spanner wrenches are often used to tighten shafts or pipes