b.chimera old custom ad unit

<!-- BelowTitle -->

<amp-ad width="300" height="250"
type="doubleclick"
data-slot="/45470634/clickio_area_655037_300x250"
json='{"targeting": {"show_backup": "1"}}'
rtc-config='{"vendors": {"prebidappnexus": {"PLACEMENT_ID": "17533797"}}, "timeoutMillis": 500}'
data-multi-size-validation="false"></amp-ad>