I don't think the OPs rod was built on a Phillipson blank. The color is off. In addition, the hardware does not appear to be Phillipson. Bill Phillipson typically built complete rods for his customers. The Powerflex rods are a good example of Phillipson rods made with customer specified paint and thread. The Powerflex rods have Phillipson ferrules and reelseats. Even the Orvis Fullflex rods have Phillipson ferrules - although the rest of the build was done by the Orvis shop.If anything, the OP's rod looks like a Wright & McGill ferrule to me. The welt on the female ferrule is more triangular than round, which is a W&M hallmark.
I'm changing my mind on this. The OP's rod appears to have a Phillipson ferrule. The rods in the photo below are, 1) an Orvis Fullflex with a Phillipson ferrule, 2) a custom rod built on a Silaflex blank with Super Z ferrule, 3) an Eagle Claw rod, 4) a Wright & McGill rod. The W&M ferrule welt is very triangular - more so than the OP's rod. Also the two embossed rings on the OP's ferrule are spaced much more like the Phillipson.
The second photo shows a Phillipson reelseat on an Orvis Powerflex rod. The OPs rod may have an Orvis reelseat, but usually those also have a walnut reelseat spacer.