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After all, you can find the Jerusalem Cross (symbol of the Equestrian Order of the Holy Sepulchre of Jerusalem) on cuff links, as well as the Maltese Cross, which is the symbol of the Knights of St. John. You can also find Benedictine cuff-links. So why not the Dominican shield?
I have the lapel pin, which I purchased from this online store. But I have searched in vain for a set of cuff links. I would be most grateful to any reader, particularly outside the United States (since I believe I have scoured the US via the internet unsuccessfully) if you could forward me a weblink to a store that sells this elusive element of sartorial esoterica.