Dating the Frame

I'm going to have to change the blog description.

So it turns out that I was very slack and just guessed that I was dealing with a 1970s frame. After visiting cykelhobby it turns out that the frame is really from the 60s! The linked page describes that frames with a serial number starting with a 3 are from the 1960s and a serial number starting with 4 is a 1970s. I have no idea exactly when and would love some help but if the brakes are original then it is most likely mid-late 60s.

Dating parts

Dating all of the components will be an ongoing process. Whilst I have no desire to make the bike truly period correct, I do want to make sure I'm within ±5 years with my replacement components. More than that though I'm just curious as to when the parts were made, what parts are original and why ebay replacements cost so much.

What I know so far.
Brakes
Mafac Dual Forge, Centre Pull.
Classic Lightweights suggest they are mid-late-60s as they are stamped "Dual Forge" and not "Racer" as the later models were.

Cranks
Sugino Mighty Competition
Everything I've read suggests these are late 70s to early 80s

...and that is it.

All comments and suggestions are welcome.

A little history...

The bike was purchased in May 2007 from Mjölby, Sweden. I was lucky to get it out of Mjölby let alone back to Australia as the Östgötatrafiken (local train company) wouldn't allow me to take the bike on board. Thankfully, the man that I had purchased it from kindly drove me the hour long trip back to my flat. He said he was happy to see the bike going to Australia to be restored; I was happy to not have to dink my girlfriend 70kms on flat tires.

I had to pack the bike into a box to travel with me back home to Australia so I decided to strip as much of the weight from it as I could. The chain went, as did the bar tape (at least 30grams saved there!). At the time I had decided to turn the bike into a fixed gear machine so I also did the unthinkable and simply threw out the Nuovo Record derailleurs and shift levers. I learned a very valuable lesson there about checking the value of bike components.

On my return to Melbourne most people I asked suggested I attempt to restore the bike to original condition rather than fix it. Combine this with the realisation that in a big city fixed gear cycling was really quite trendy (unlike myself) and it was settled, I was going to have to restore it.

The hope is that this site can serve as an information and image repository for myself and an invaluable source for the many millions of non swedish speakers out there restoring a 1970s Swedish racing bike.