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That's HG, the clues are a: the thin spline and b: the female thread for a lock ring. Uniglide have a male thread to take the top sprocket which also acts as a lock ring and all the splines are the same width. There are some transitional hubs with both threads and the HG spline which will take UG or HG cassettes. There's a good article here with pictures.
gbj_tester
Seven-speed cassette options for a Shimano 105 FH-1051… is this old thing Uniglide only, or Hyperglide compatible?