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@Skülly
OK, I found it.
http://www.bicycleclassics.com/bottom.html
Look down the bottom, they got the length for 77-87 as 114.5, and so pre-'77 is the 112.
Ok so if it's 77 or later, you'll need 114.5, if it's earlier you'll need 112. 111 might just be ok, you can get those easily (Veloce). However I can't guarantee what chainline they'll give.
The only way I can see of being sure of a perfect chainline will be some luck, or a Royce floating BB.