I agree that, at least in my neck of the woods, OTC-marked sockets are not common, don't think I've ever even seen one. I do come across the occasional OTC specialty auto tool, but not sockets, rats or wrenches. Good find.
I did include a pic. I remain unconvinced. I have a deep respect for everyone here, but holding the socket under magnifying glass, I believe it still to be cTc.
Thanks
alton1911
I did include a pic. I remain unconvinced. I have a deep respect for everyone here, but holding the socket under magnifying glass, I believe it still to be cTc.
Thanks
alton1911
I don't think there's any question you're seeing "cTc" but that is almost certainly an incomplete or damaged stamping, which happens quite often across all tool manufacturers.
Brian
For what it is worth I agree. I have found some other examples on ebay, and the part number is not an otc number for a socket.


Did you buy it? Now, if you did....you're required to show the pics. You knew that, eh?I am happy to be able to help. Canada has its own quirky tool history... Proto of Canada, Challenger Canada, Challenger by Proto... Mac tools Canada etc. but my personal favorite are the GRAY tool line of industrial tools.
I came across an odd ratchet today, a Pennens 1660 style, co marked challenger Pennens corp. with the Challenger R12 markings around the selector edge... I need to stay out of the Habitat store...![]()
Not at all unusual.I came across an odd ratchet today, a Pennens 1660 style, co marked challenger Pennens corp. with the Challenger R12 markings around the selector edge...
Did you buy it? Now, if you did....you're required to show the pics. You knew that, eh?

FM started in US then went to importThere is/was a Canadian company CTC, Canadian Tool Company. I don't know if those are them, but I do think there are Canadian tool threads here on the vintage forum. Maybe something will be there.
I think Forge master is Taiwanese.