CH 1987 731/42 Mail delivery (6 values of 1986) Fluorescent paper Early Date Full Cancellation

Switzerland 1987 Mail delivery (6 values Issue 1986)
Fluorescent paper (paper change 1987)
6 values:
with Early Date Full Cancellation "15.07.87 3000 Bern 1 - Annahme" for 5, 10, 25, 35 und 90 Rp.
with Early Date Full Cancellation "28.04.87 3000 Bern 1 - Annahme" for 80 Rp.
earliest known cancellation date of the stamps according to the certificate Renggli
(SBK 731/732/734/736/741/742, Michel 1321-26yb)