My sweet Cummings Water Witch was reported to be a St. Croix blank by an infrequent FFR member who had a Vince Cummings connection, with the beauty highly polished and brightly translucent brown. Russ Peak also used this blank.
I've honestly never seen a St. Croix marked rod that exactly used it, though later St. Croix rods are similarly polished, so I suspect it was made by St. Croix to Vince's spec.
Since Herters sourced blanks from both St. Croix and Montague/TT who probably reverse-engineered a Conolon blank, Herters might still be in the game.
I wouldn't rule out Conolon, either, but the reel seat our OP posted sure made me think Herters - and it's possible the reel seat was sourced separately from the blank - I doubt if it was a kit rod. Herter's is east coast, as is Montague. (In the west, Cabelas was selling Wright-McGill blanks.)
Unfortunately, I don't have a better-lit photo of a Conolon Royal Javelin, but this was a 50-y-o NOS rod with a $35 price tag still hanging.
The OP reel seat (his photo) wedges a spinning reel foot better than sliding bands alone, but comes up just short of the Phillipson patent seat by not having threaded bands.