Older T/c Breech plug identification

[Steelheader323]

Found this in my drawer…have no idea what is was for..look similar to a black diamond plug but different..a black diamond 209 adapter fits it well so I’m assuming it’s a t/c breech plug…I have never owned a system 1 or woods rifle..could this be a plug for one of them?

 

[phalanx]

My woods rifle and black diamond take the same breech plug, yours looks different so probably not one of those.