PRP-4M
Note that designation of PRP-4 variant with TI 1PN71 sight is PRP-4M/MU, that implies it definitely ISN'T basic version introduced in 1984 (besides started appearing on exhibitions in late 1990s). Basic PRP-4 was just equipped with better radar than PRP-3 (Tall Mike vs. Small Fred).
Also mentions of this sight (1PN71) started to appear only with BRM-3 recon vehicle, IE 1990's thing as well.