Great drawing of the X marks, Marcos! Many times a drawing of the mark is more distinctive and easier to id than a photo of the mark, especially if the images are not close-up or in focus. Pete ANTIQUE JEWELRY INVESTOR SUPPORT TEAM
Rating
X Mark Resources by: Yvonne
Only Three x marks so no Aussie 4 x remarks please ;-)
X marks could be an import mark. Please see the following link -
Also, you might like to check out the annual guide called - The Jeweler's Index which contained Jewelry marks that Keystone Publishing published in the early 20th century. The link below covers marks from the 1922 edition.
http://chicagosilver.com/jmarks1.htm
The Jewelry Wizard is also useful tool for jewelry mark hunting - the link to the wizard can be found in the Antique-Jewelry-Investor.Com jewelry resources -