Looks like a 75 PX10LE to me. PX10 prices are quite depressed right now. Very nice examples can be had on Ebay for $500. Your local market may vary. This being a white lug LE it may not command as much as the black lugged E models since they are the more iconic PX10 style. This is from the picture an example in fantastic shape. I don't buy French bikes any more but I wouldn't feel bad paying $500 for that at all.
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ebay: cicloclassico
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