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These look interesting. Can you explain or describe what they are? To me they look like some kind of vintage “long blade” flex nibs. 

They are very old Aiken Lambert fountain pens as far as I can tell. Very early pens using Wirt and Stone patents (the first 2 patents used by Paul E Wirt). They have the "mercantile" "made under Wirt & Stone patents" imprint.  Nibs are very much like dip nibs and are ventless. the larger nib i believe is actually a dip nib where as the other 2 are fountain pen nibs.

Uploaded for answering what the pen mentioned in https://www.fountainpennetwork.com/forum/topic/371621-another-mystery-eyedropper-identification-help could be.