Is a mystery to me as well. I've seen an eBay ad for one of these frames that stated 130 mm spacing. Maybe some of them got coldset, whether recommended or not. This is one of the details that makes me wonder if there was a second run of these frames later; the other detail is the serial number.
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gaucho777, the frame with fastback stays and number hanger was supposedly an actual team bike, thus possibly different in detail and origin from the production frames.
The other team bikes I've seen do not have the fastback treatment. It's possible that a La Vie Claire rider had a personal/custom bike that was repainted in the team livery, but I rather doubt cut from the same cloth as the other team bikes. Here for example is Greg Lemond's original La Vie Claire team bike (not how "LOOK - Bernard Hinault" has been removed from the downtube - no bad blood there). Team issue La Vie Claire bikes do not have fastback treatment, though they differ from other production models in that the ds chainstay is chromed.
https://www.roadbikereview.com/revie...cycle-club-nyc
Hard to see, but here is Andy Hampsten on another team bike without fastback stays, also chromed ds chainstay.
https://www.pinterest.com/pin/346636502542756706/
Same thing on Steve Bauer's team LOOK:
https://www.pinterest.com/pin/346636502542743312/
Same with Hinault's bike:
https://www.velocyclo.fr/forum/de-19...la-vie-claire/
That fastback version also has different (short, non-horizontal), painted dropouts. I think it's a bit of an anomaly. I'm not convinced it's a La Vie Claire LOOK. More likely another brand painted in the team livery.