Does anyone else raise an eyebrow when they find a vintage bike with all the parts that are identifiable by date codes,timelines, etc. all perfectly corresponding with and in complete agreement with the frameset's age?
In the 70's to mid- 80's, with very few exceptions, most all top domestic and european custom bike manufacturers released new frames and components piecemeal with little or no attention to model years.
Cycling products generally evolved quietly, slowly and incrementally over time rather than changing abruptly as 'latest/greatest' ,'new and improved' with each new buying season.
New Sales Brochures were routinely distributed at the year end trade events, often featuring for the first time in print, parts that had been released and sold 'en mass for many months prior to being included in the catalogue.
Distributors wouldn't even have thought about rotating old-for-new stock inventories when the latest batches arrived from their sources since there wasn't any advantage or incentive in doing so, other than reducing the accumulation of warehouse dust on parts boxes.
If one ordered a new complete bike or a frameset with a full matching road group, it invariably would be comprised of component parts having production dates spanning several years time.
And nobody noticed , nor cared.
Nowadays, when I see one of these "perfect period correct" vintage bikes ,either on sale , display or on the road, I can't help but think that some obsessive-compulsive type spent far too much effort in restoration
- IMO, such a bike is actually over-restored since it is highly unlikely that the bicycle was ever assembled so "correctly" when it was brand-spanking new .
(end of rambling old -codger diatribe)