Whilst not exactly the same pattern of engraving, your fork looks remarkably like my Bailey & Co. POINTED END TWIST (LEAVES).

Also, your fork's lion mark looks like the larger of the two lion marks on my knife. I would guess that Hayden & Whilden was the retailer and that your fork was made in Philadelphia under the auspices of Bailey & Co., who had exclusive relationships with various smiths there.
Sadly, we hardly ever know the true names of the patterns of this era (ca. 1860's). I have used a simple descriptive name to identify it.
The sifter's mark is the more notable of the two shown, since it includes the rare elephant mark with the Bailey coin standard marks.
Stan