Used stamps exchanges.

Dear collector,
My name is Vladimir, and I am from Serbia. I recently discovered stamp exchange over internet, and like you, would be happy to receive different stamps than I already have. My stamps are used, mostly from Yugoslavia, Germany, USA, some Hungary, Singapore etc.
I am interested in three specific topic (country is irrelevant):
1. classical music composers, musical instruments, motives from famous operas and similar,
2. motives of electrical pylons on post stamps, electrical substations, hydro dams, power plants and electricity, including famous scientist like Ampere, Franklin, Oersted, Faraday, Edison, Tesla etc. Please, check my collection on https://eu.zonerama.com/Vladimir74/1366346.
3. bicycles without motor - just simple bike, also cyclo-cross, mountain bike racing, Tour de France, and similar.
Since some of this motives are rare, I will be very grateful if you send me undamaged used stamps from your country (CTO is ok), or any else that you have for the exchange.
I will be happy if you use regular non self-adhesive post stamps on the envelope.
Thank you!
Vladimir

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