Help needed on colonial copper ID

[Bill D. (VA)]

I probably should put this in the "What is It" forum, but thought I'd try it here first. I dug this coin a couple weeks ago at a 1640s land patent site. Its the same site I found a year ago through research, but it didn't produce much. But just about everything I dug there was 17th century. I went back recently with my new machine, and found this copper at a great depth using the boost mode on my F75 Special Edition. It came from an estimated 12-14" down. I thought it was just a slick copper, but I just noticed in the pics I took that I can see an "R", and possibly other detail in the first 2 pics below. Can't seem to pick out anything on the other side. This coin is very thin, is slightly oblong in shape (about 23x22mm), and weighs 2.85 grams which is exactly what my Lord Baltimore sixpence weighed. I didn't immediately recognize this coin, and thought someone might be willing to make a wild guess. I think its likely to be 17th century but no way to be sure. Anyway, I appreciate any help with this. You'll need to click on the thumbnails below to enlarge.

 

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[Bramblefind]

Maybe a France Louis XIV 1600s liard. They are close to that size and have the FR. in the legend.

 

[Bill D. (VA)]

Maybe a France Louis XIV 1600s liard. They are close to that size and have the FR. in the legend.

The liard is a pretty good possibility. The diameter and weight are close to mine, plus the little bit of inscription around the periphery of my coin matches up nicely with your pic. And with the "D" mint mark it would have to be dated either 1655-57, or 1693-99. The only thing that bothers me is that the relief on the liard is fairly high, and you would think that at least some small evidence of that would be noticeable on my coin, which it's not. But that's probably as close a match as anyone's going to come up with. Thanks a bunch for your help.