1950 R O Harrison ‘project’

[juvela]

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thanks for the additional image

at first glance originally thought "Brit"

now with the better image thinking Agrati/Malaguti/Ekla

1950 date brings Malaguti into the realm o' possibilitude

lugs do not appear self-cut by framebuilder

for example, one can see a hint of "family resemblance" to this Ekla set -



this catalogue page from Brown Brothers shows an assortment of EKLA bits -



forum member @bulgie has framebuilding experience; he may recognize this pattern straightaway

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[Chdot]

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thanks for the additional image

at first glance originally thought "Brit"

now with the better image thinking Agrati/Malaguti/Ekla

1950 date brings Malaguti into the realm o' possibilitude

lugs do not appear self-cut by framebuilder

for example, one can see a hint of "family resemblance" to this Ekla set -

View attachment 1016863

this catalogue page from Brown Brothers shows an assortment of EKLA bits -

View attachment 1017009

forum member @bulgie has framebuilding experience; he may recognize this pattern straightaway

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Thanks

It’s also got a nice seatpost clamp lug -

 

[Chdot]

Recently

 

[juvela]

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thank you for the additional pictures

pattern somewhat reminiscent of some Agrati creations

have an undated catalogue from this manufacturer which from internal clues tentatively date as 1970

conceivable it could be a pattern discontinued prior to publication

pattern does not resemble any Oscar Egg sets have seen but am certainly no expert there...

will look forward to framebuilder input


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[Chdot]

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crown appears EKLA model Oval (offered both with and without recess in front/back)

"some" EKLA crowns exhibit a raised marking on their undersides

View attachment 1016815
View attachment 1016818

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“The Pro crowns are in a sense a triumph of “emboutissage” but the method of manufacture did create two gaping cavernous holes inside the crown that it would have been impossible to fill with brazing alloy. Even a well-brazed crown would only have line contact around the perimeters of the holes and along the fancy cut-out and tangs resulting in a somewhat weak construction. On the other hand, around the early 50s, companies such as EKLA and Wagner had started producing very strong accurately cast steel models that gave full contact areas for brazing between the column, fork blades and the crown itself. Any self-respecting frame-builder would prefer to use either cast or forged crowns, they resulted in much stronger and better performing fork units that were less likely to bend in use or from which the blends could not work loose due to the lack of brazed area and contact.”

https://www.classiclightweights.co.uk/classic_builders/lockley-norris/

Plus a lot more on frame building and lugs.