Costa Rica used and mint stamps good curious odd variety postmarks

I am a dedicated part time stamp dealer and try to offer what I consider interesting stamps.
For me interesting stamps are those full of history but also those rare difficult to find ones.
For value the stamps I take into consideration several catalogues Scott Michel Stanley Gibbons basically.
But I allways offer attractive prices.
I want to share the experience of immerse yourself in the history behind these papers, their design, their technical qualities, the illustrated themes, in short, a world where you can observe, relax and focus your attention. It is extremely relaxing, and the next day you will want to return from obligations to immerse yourself in this beautiful hobby.
I want to share my knowledge and experience so feel free ask questions.