OK, I have a very nice Columbia (Illinois I think), 18s pocket watch in a beautiful gold case. At least, I suspect that it might be solid gold. There's only an eagle hallmark and a 4 digit serial number stamped on the inside rear lid. Here's a shot: There are no other markings on the case. There's also no signs of brassing on the case and the whole thing has a softer feel to it - meaning the back lid and dust covers are not super rigid like a gold filled case. The back lid is also dinged in a couple of places and there's a hairline crack along the part of the outer edge of the back lid (I can see where someone has attempted to repair this circular split), and it appears to be solid gold all the way through the crack - to the extent that I can see it at least. I am wondering if anyone has seen this particular version of the eagle hallmark and if so, what does it signify (if anything)? I've read that it signifies a 16KT case - but that was for a slightly different rendition of the eagle... I've also read that if an 18 stamp is found near the eagle but without the K (for 18K), then it is most likely 9KT gold... Any additional information is appreciated... 2 jewelers also tested this case and both said that it was 14 KT...one said maybe more.