Help with lockplate ID

[Riggleman]

Yesterday I found this object at an 18th century homesite. It was dug over a foot deep, initially i thought it was an old hunting knife. After some looking i believe it is a lockplate. It is very different to 2 that I have found this year. It has a longer bar extending from the frizzen spring, also there is no powder pan that I can see. I am positive this is a lockplate but cannot find an example. I am currently running electrolisis to help with ID, I can post pictures when I get home from work. Any suggestions on model, type, or age would be greatly appreciated.

 

[NOLA_Ken]

some cleaning will help, what you're calling a frizzen spring is actually the mainspring, it's a percussion lock, but I can't tell much more than that

 

[Riggleman]

Ok guys here it is after some cleaning, im gonna run electrolysis a little more but hope these updated pics help

 

[sutphin]

NEET BRITISH FIND/////??