This 80s vintage Columbus steel frame was purchased from a now defunct bike shop called Vaquer Cycles in Brussels, Belgium in 2015, and shipped to Boston where I built it up using parts from another classic road bike, using a mix of more modern Shimano Ultegra and 600 compontents.
At the time it looked brand new, and the salesman said it had never been built up previously, so I suppose I can be considered its first rider. I then rode it around for years, and it shows. Lots of the decals no longer look pristine, but the steel frame shows no sign of rust. Steel is real, and this one will last many lifetimes still.
Ludo is a Belgian bicycle company started in the 50s, now known as Granville (https://granvillebikes.com/history/). Most of their frames were Ishiwata, but this one was made with higher quality Columbus tubing. I'm assuming it was the top-of-the-line offering whatever year it was made, as "Superbe" was the name of top of the line race bikes made by other brands of that era, like Raleigh. As such, it probably used the "SL" Columbus tubing, but there's no way to be sure considering it has the generic Columbus stickers, as did most Columbus tube bikes of the era.
I can't find any specific information about this model online, which means it's pretty rare. Here's some information about an older and lower quality bike named "Ludo Excellence" : https://steel-vintage.com/products/ludo-excellence-classic-bicycle-1970-s-detail
Right now it's set up with 28" tires, an unright stem, and gravel bars for a nice mix of comfort and speed. However I can also switch out the stem, bars, and tires for something speedier/more typical for a classic road bike if requested. The modern Shimano Ultegra lever shifters still work great, and the Ritchey training wheels are in great condition and have been well maintained.