Identification guide for designs of United States stamped envelopes, wrappers, and letter sheets.

Identification guide for designs of United States stamped envelopes, wrappers, and letter sheets
eleven and one-tenth cents

There is only 1 design of an indicium whose face value is eleven and one-tenth cents. It is:

birds

design U166

You have identified design #U166, diagnostic for
Scott #U620 (printed in blue and red on white paper).