It's a Pilm but it looks like an Alfa/ AMP/ ITW/ Mitre Mite now Fletcher knockoff.
There are Gielle ones shown, also Pilm, in the link posted for Aim Enterprises.Here's the machine on the pilm web site. If you can get someone to do the conversion to whatever number it was when Fletcher -Terry was painting them green and selling them under their name, you could resource the V-nails. I have the Fletcher 5700 which is the same model but with two vertical clamps.
Actually, you could call Fletcher-Terry and ask them where to resource the v-nails. I get minr through a distributor in S Fla. called Complete Framers Supply. The V-nails are made by Gielle.