The "Incabloc" marking refers to the type of shock protection unit used on the balance assembly. Incabloc is one of the most commonly used. For more info you'd likely need to provide good photos of the watch, including the movement.
The Mikrolisk Trade Mark Index (link below) lists a couple of entries for the "Swan" brand. It's not one I'm familiar with, but there were very many smaller brands/assemblers that don't have much history.
The case style indicates the watch was likely made in the early to mid-1970s. Caseback markings should indicate what the case material is. If it states "Stainless Steel Back" (or "Fond Acier Inoxydable") then the case itself will be plated base metal. If it states "All Stainless Steel" then both case and caseback are steel.
The movement? I'm not sure. It doesn't ring a bell with me offhand. Hopefully someone will be able to ID it. Many have the caliber reference and/or maker's mark under the balance wheel, and yours has markings stamped there but I can't quite make them out.
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