Mystery Bike Tool

UPDATE - Mystery solved, I believe it is a Shimano 5 Speed Freewheel tool. Thanks for all the help.


WTF tool is this? It has been in my tool box since the early 90s. It is smaller than a shimano cassette tool.




Bicycle Research has a web site that shows it's cassette tools:
http://www.bicycleresearchtools.com/wheelt.html#anchor270825

Maybe it is the CT-4 Normandy tool? Or is the CT-3?

Harness the power of the internets and let me know if you have the answer.

Thanks,
-Joe