Good luck with the second Halina 35X. I had one in the early 1960s and it worked well and was reliable. I naively felt it was like having a Leica and I loved it. It was my first 35 mm camera after having made great use of my Agfa Isola which took 120 film, and before which I had cameras that used 127 film. I processed the films using a Johnsons of Hendon Home Photography Developing and Printing Kit that I had been given one Christmas.
I remember using Johnsons/Paterson Unitol - a very good developer in its day, well balanced for sharpness, grain and contrast as mentioned in Troop and Anchell - and contact printing the negatives on Kodak Velox paper that had been specially designed for contact printing in artificial light. I had a wooden contraption with an internal ordinary lightbulb and a wooden flap that acted as a shutter, operated by a revolving knob that allowed me to time how long to expose the negative that was held against the developing paper by a bakelite device that used a small sheet of glass and a spring loaded back. Many happy hours. I would have been eleven at the time, in late 1956. I've still got some of the contact prints.
I got the Halina in the early 1960s and used FP3 at the then Ilford rating of 125, an earlier emulsion of FP3 having had a rating of 64. When I was twenty-one there came what was for me a breakthough, a Praktica Nova 1B, an SLR with a 50/2.8 Domiplan lens, later upgraded to a Carl Zeiss Jena Tessar 50/2.8, which served me very well until I bought a Pentax SP1000 with a screw-mount lens, the Super Takumar 55/2 and a Super Takumar 28/3.5, both fabulous lenses with lovely rendition on B&W film, especially HP4 and Tri-X (with the emulsion the latter had in the early 1970s). After this it was all onwards and upwards until I stopped buying cameras several years ago, ending up witth a fully working 35mm collection that gives great pleasure.