Would have to be 1930's or later after Union Pacific Railroad's Old Timers Club came into existence. Pin for Chairman/Chairwoman (or chairperson) of Ladies' Auxiliary (LAUP) to the club. We seem to have a few possible firms for which there is no mark to go with Trev's entries. Encircled, intertwined letters of H-in-W and possible A (for "and" ?). TIA
A long circuitous search results in Whitehead & Hoag Company Newark NJ using this mark. They produced 20 year pins for this organization using standard marks on non-precious metal. This particular mark has been used in conjunction with a Sterling word mark, and here with the 10k Gold mark. Company absorbed/closed/dismantled 1959 (name used to c.1965).
A search of UPRR on-line document (2014) covering history of employee clubs and predecessors indicates ladies' auxilliaries began forming in the 1920's along with the main clubs (contradicting a 1930 date elsewhere). [Officer titles follow the form of President, Vice-President, etc. rather than Chair.] Consideration of dating this W&H mark format might be moved earlier until additional information is found.