For the letter B - batik
2011 - Indonesia - Traditional Textiles
The red & black (Batik Madura Jawa Timur) stamp was from a mini-sheet issued on 6 July 2011. The brown & white (Batik Parang Garuda DI Yogyakarta) stamp was from a mini sheet issued on 30 March 2011.
Batik is a traditional textile from Indonesia and perhaps the most popular. Each time I see an intricately patterned printed fabric with an ethnic design here in the SE Asian region, right away I would think, "Ah, that's batik!"
I've been to Indonesia several times now since 2015. I've become more well-informed that batik is but one of the traditional textile design techniques. Here's an article about the different Indonesian traditional fabrics.
for more stamps with the letter "B" - visit See It On A Postcard