Anyone recognize the artist behind this signature?

[Sir-L]

Hello Sir-L,
A potential help from the other side of the Channel :
Investigate on Joan Aliu Puig. Coming from a little town about 50 miles from Barcelona, I expect potential contacts with the SI team, and why not Martin Salvador.
For the fun, the art from Helgonet has been translated in France for two "Le Saint" Series. You can find some data at www.dlgdl.com/GENPAGES/DSE_CSA2.HTM or same with SA3 ... including an Helgonet scan ...

Oooo, I totally missed this. I think you've nailed it!
It definitely seem that it could be Aliu in the signature.
Not easy to track down example of his work on Internet though.

Very interesting information about the French publications too.

Thank you very much for this!