there are other museums to check but @letterformarchive.org@bsky.brid.gy and @designreviewed.com@bsky.brid.gy might have some ideas technically this is letterpress printing with spot colour inks; you can also tell it's been through a platen press by the imprint of the numbering machine bsky.app/profile/symb... RE: https://bsky.app/profile/did:plc:osg2vzhifd2tjfsvfwua7scy/post/3mjahg44kmc2x