Stamps Year 1991

1369 - Protection of nature, protected marine animals, branta bernicla
joaquín iturrioz
1368 - Protected bird, sterna albifrons pallas
joaquín iturrioz
1397 ? Post Office, Stralsund
joaquín iturrioz
1389 - Centº of the transmission of electrical energy via three-phase current
joaquín iturrioz
1365 - 18th World Gas Congress, Berlin, Wilhelm August Lampadius
joaquín iturrioz
1357 - History of airmail, airship
joaquín iturrioz
1355 - History of airmail, single seat
joaquín iturrioz
1354 - History of airmail, Junker FI 3 of 1930
joaquín iturrioz
1339 - Sommerenzian flower
joaquín iturrioz
1335 - 400 Anniversary of the birth of Friedrich Spee von Langenfeld, writer, religious man
joaquín iturrioz