I'd appreciate any help from the forum on this. I inherited a very old (I believe from the 1850s) St. Christopher Patron Saint of Travelers gold medallion from a family member. It was passed down the family line to me. Apparently, this ancestor was a gold rush 49er in California during the early 1850s and family legend says that the medallion was given to him by his father before he left for the gold fields. Anyway, below you will see photos of the medallion as well of the close up of the hallmark. It has the 18k stamped on the back and then a hallmark symbol which looks like an arrow between a colon (see photo). Can anyone identify this hallmark?
I've researched online and can't find any reference so I am hoping someone can help me here. Thank you in advance!
![Image](https://www.925-1000.com/pics/Ximg.jpg)
![Image](https://www.925-1000.com/pics/Ximg.jpg)