Not a PX10E but a PX10L. PX10s have chrome socks on the rear stays and chrome fork ends, plus a few other more or less unique identifying features. This bike has plain whit lugs with paint outlining. That would make it a PX10L. '74/75.
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70 Pogliaghi ItalCorse, 72 De Rosa, 72 Masi Gran Criterium, 75 Masi Gran Criterium, 77 Melton, 79 Bianchi Super Leggera, 79 Gios Super Record, 81 Picchio Special, 82 Guerciotti Super Record, 82 Colnago Profil CX, 83 Colnago Superissimo, 84 Fuso