I have a Castela Guitar that is steel string adjustable bridge with truss rod and Has lable on inside that says trump. I don't know much about this model, but I took the adjustable metal piece that holds the saddle and worked a buffulo bone at a slant so it rests completely on the sound bord top and tight up against the bridge and same replaced the nut with bone and the guitar sounds and plays wonderful with 1/8 at the 12 th fret. tightened the truss rod and neck is straight with room to lower action further at the saddle and at the nut. I don't want to lower it further as it may loose the beautiful sound some I am getting from it. Sweet guitar. I usually wind up putting them on Ebay after I play them for a while. I am always seeming to get low on cash and fix and sell. But this guitar suprised me. Looks like & or a T written under the Label Trump. I imagine its T for trump 210...T210. Any info is appreciated...seem like 70's not sure.