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regarding standard of tubing diameters and threading on the frame -

if convenient, one easy check you can make is to measure the outside diameter of the frame tubes

a metric standard frame would have down and seat tubes of 28.0mm, a top tube of 26.0mm and a steerer of 25.0mm

a BSC/ISO/IT dimension frame would have down and seat tubes of 28.6mm, a top tube of 25.4mm and a steerer of 25.4mm

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the combination of a metric shell with a 27.2mm saddle pillar is somewhat unusual but certainly not unheard of. for example, MCB of Sweden, makers of Monark and Crescent brand cycles produced wares which had BSC dimension tubes paired with metric threaded shells.

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1984 was about the time Spain was in transition from the BNA standard to the ISO one. there certainly may have been some cycles produced which bore traits of both sizing standards...

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the L-star logo/marque -

one convenient spot to get an overview of Iberian marques is the reciclone site. this is a business which offers primarily replacement transfers for cycles of Spanish manufacture. a few marques from other lands are also included.

checked their lists and the symbol does not seem to be shown.

https://reciclone.com/


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