Detachable Head Wrench ID?

[jkoll42]

I am trying to figure out what this wrench is. I have this handle and a straight handle with soldering repairs and a number of english heads that slip into the top of the tool. The only markings are the patents pending stamp.

 

[Oldtuleguy]

Looks like a park metalware interchangeable head wrench.

 

[jkoll42]

Yes! That's it - don't have that full set but it's exactly the same. Any idea how early it is with no branding of Park and patent pending?

 

[Oldtuleguy]

1920ish. I think there is a thread on them here somewhere.

 

[Private Lugnutz]

Index, Sticky.

 

[jkoll42]

Thank you - still getting my way around the forum. Would be cool to have that outer box!