Hello,
It is an engraving and is on top of the what would be the receiver on a cartridge rifle. It is about 1 and 1/2 inch long. It has a scroll like embellishment on both ends of the fish symbol ending in a leaf or feather. It was painstakingly and well done by freehand. The engraving is not just a light surface drawing. The head of the fish points to the muzzle. It has a gorgeous curly maple stock, is chambered in .45 ( as determined by measurement, The caliber is not marked on the barrel which leads me to think it is not a replica ), Has a brass shoulder pad, has a set trigger and looks like a Pennsylvania style rifle. I can't recall if the trigger guard is brass as I have not seen the rifle for a few months.
I have little experience with muzzle loading flintlocks or percussion rifles and I know there are some awesomely talented rifle makers out there who can produce some beautiful custom replicas of these guns so I can't be sure if it is authentic or not but my friend is sure of it and has had this one for 30 plus years in his personal and extensive collection of American firearms. He kept it in spite of the fact that he is not a flintlock collector but rather a Colt, Winchester, and other Civil War and 1st generation Western firearms collector. He has bought and sold a lot of flintlock firearms as he has traveled all over the United States to gun shows and auctions. My friend kept this one because of it's fine condition. He is a retired machinist and gunsmith and the most trustworthy and honest fellow you could ever meet.
My research so far has lead me to the conclusion that this piece is worth the price he is willing to sell it to me for even if it is just a fine replica and not an authentic period rifle so I'm going to purchase it from him as soon as he is well enough to retrieve it from his shop.
I will share pictures of it as soon as I can. It is impossible to make a judgment call on anything without detailed photos. As I have stated before, I should have waited to post until I had the rifle in hand. I just get excited sometimes and I just "jumped the gun" on this one, so to speak.
This is a great site and I am happy to have found it. It was recommended to me by a kind gentleman from the Traditional Muzzleloading Forum.
Thanks again!