Thread:DonaldoC1997/@comment-39121060-20190928171627/@comment-3004323-20190930190055

Here's some testcards:
 * https://www.youtube.com/watch?v=6ugGUDbEaJM (1957)
 * https://www.youtube.com/watch?v=P6_hRzhkIm4 (1957)
 * https://www.youtube.com/watch?v=kqQf-9ZGpCc (1957)
 * https://www.youtube.com/watch?v=80s_dz-v_yU (1960, notice the wordmark in white inside the symbol)
 * https://www.youtube.com/watch?v=yV8qytGjsFc (1970)
 * https://www.youtube.com/watch?v=238jIvVHoHo (1980, at 3:07 as TN-NGAS 1)
 * https://www.youtube.com/watch?v=XWj-hOX8ekk (1980, at 5:45 as TN-NGAS 2)
 * https://www.youtube.com/watch?v=0zwoJ2r3yXA (2002, a variant with TN-NGAS 2 is available)