|For years DAV has used low
denomination coils on the mailings. Since USPS now produces only
untagged versions of these stamps, the contributions sent to DAV in these
return envelopes do not have the tagged stamps necessary to activate the
USPS facer/cancelling machinery necessitating non-automated handling.
Reports in the philatelic press indicate USPS has been requesting DAV to
add some sort of taggant to these return envelopes and that DAV has refused
due to the added cost.
Perhaps by design but most
likely by pure chance, the Circus Wagon stamps on this cover are printed
with the red ink which slightly responds to both long and short wave ultraviolet
light. Collector initiated tests several years ago showed that these
stamps did receive more machine cancels than did completely untagged stamps
but less machine cancels than the tagged versions.