Mystery frame?

[vetnherder]

Hello Forum!

I'm trying to ID the brand of this frame, I plan on having the frame stripped, filled and repainted, want to take it out at sunny days for shorter trips. I would love to add the correct brand decals.

This bike was probably bought in the Netherlands and stayed there ever since. (I live in the Netherlands as well) It was the bicycle of my late dad, who in the early 80's gave it to my recently deceased uncle, and we found it back on his attic about a month ago. (thought it was gone entirely.)

Sentimental value mostly. This forum is my last hope in the quest to determine a possible brand. (I think)  

Known:

The handlebar is a Belgian 1967 Titan (67 is engraved/stamped at the bottom of the bar)
The lugs are Prugnat 62S
The stays do not have a flat inner like Gitane.
The rear derailleur is from 1983
The tubing on both fork and frame is almost certain Reynolds 531 (decal is almost gone but recognizable)
So far I did find no markings (numbers, names etc) on the frame or fork. bottom of the BB included. The BB housing is closed at the underside, no holes, slots or stars, no cable guides.
The dropouts are Campagnolo
The bottlecage holes in the seattube are most likely added later, the decal was added before the holes...
The decals "Course" and the decal badge "Champion" are most likely generic decals added later. (It seems there is no connection with the Swedish brand "Champion". )

The seatpost diameter is 27.2mm (the current Campagnolo seatpost sits snug but not too tight or too loose.)

The BB measures 68mm 1.37x24

The Stem/Quill is 22.2mm

The headset is (Shimano Exage Hp450A) 25.4mm

Stem is Mavic

Hubs are Campa Nuovo Record

Fork crown seems to be similar with some other Belgian frames. (Teval, Samyn) The stamps at the fork crown bottom are the only actual markings I have found. (on frame and fork that is)

Bike was upgraded over the years, with the oldest part I could date, (handlebar) from 1967 and the latest part being a Shimano UN52 BB from around 1998.

If new photos of certain sections are needed for identification, please let me know.

Thank you for taking a look!

[didi1783]

good evening, is no PS engraved under the box? the fork seems to be a (sport feather)

[vetnherder]

Sept 14, 2022 20:30:28 GMT 2 didi1783 said:

good evening, is no PS engraved under the box? the fork seems to be a (sport feather)

Evening! Thank you!

No PS engraved! Not a single stamp/engraving on the frame or below the bb, except for the Campagnolo dropouts. (both on frame and fork)

The frame has some similarities with Plume Sport bicycles I see online. (but none so far has all the similarities in 1 frame)

[vetnherder]

Slight update: frame is now almost entirely naked.

Any other tips and or pointers? For me it is a really hard nut to crack. It is my first roadbike.
(I now wish I had paid more attention when I had French lessons at school, sorry to rush in here with my English.)

Meanwhile the frame is almost ready for stage II of this operation. (stripping and filling)

[Munny]

Why ...

You just need to peel the part of sticker and replace correct ones.

This paint is original and the state is called "Patina"

[vetnherder]

Sept 21, 2022 20:21:09 GMT 2 Munny said:

Why ...

You just need to peel the part of sticker and replace correct ones.

This paint is original and the state is called "Patina"

I don't think that this Patina state will do it for me.   (Don't hit me!)

If the entire bike was still super original (with all the time period correct parts, pointing back at an exact catalog model, it probably would be a better choice to keep it as is, renovate the moving parts and ride it like that.)

The problem is that I don't know what the correct stickers are,  the brand of this bike is the big unknown. My quest is turning out to be a frustrating one.

[didi1783]

a photo of the underside of the box?

[vetnherder]

Sorry, I just got home!

[didi1783]

veloretrocourse.proboards.com/search/results?captcha_id=captcha_search&display_as=0&page=20&search=Search&what_at_least_one=plume%2Bsport&who_only_made_by=0

[vetnherder]

Fork dropouts on mine: (less smooth/clean than Plume Sport?)

[Munny]

Based in these fork dropouts you can exclude Plume Sport and several other belgian frame builders

[vetnherder]

Oct 6, 2022 19:42:11 GMT 2 Munny said:

Based in these fork dropouts you can exclude Plume Sport and several other belgian frame builders

Merci! Thank you! 

This seems to be a difficult one.