Bulgaria: Sheet of airmail labels

Here is a nice and complete sheet of airmail labels issued at the occasion of "BULAGARIA '89" stamp exhibition.

Year: 1989, Gummed. Günter Mair's catalogue no: - BUL-C-1b, imperforated, sheets of 12(3x4) + 1 label BUL-C-2, issued at the occasion of "BULGARIA '89" stamp exhibition, 22.-31.5.1989, Sofia. light blue/white, 2**

Year: 1989, Gummed. Günter Mair's catalogue no: - BUL-C-2, imperforated, comes together with BUL-C-1b, issued at the occasion of "BULGARIA '89" stamp exhibition, 22.-31.5.1989, Sofia. light blue/white, 3***