Item #: SCP-XXX
Object Class: Safe
Special Containment Procedures: SCP-XXX is to be kept in a climate-controlled facility, and must remain closed and bolted except during approved exploration. All exploration team members must receive dialect coaching and full-spectrum vaccinations before entering SCP-XXX, and undergo decontamination and a 96-hour quarantine upon emerging.
Description: SCP-XXX is an antique casement window, originally taken from the abandoned business offices of███ ██████, a 19th-century patent attorney in Chicago, IL. No matter where it is mounted, SCP-XXX opens onto the street outside███ ██████'s third-storey office, as it was between 8:30 AM on Friday, March 26, 1875 and 10:45 AM on Saturday, March 27, 1875. Personnel exiting this window find themselves in what is apparently 1875 Chicago; however, at the end of the 26-hour interval, the city 'resets'. Any external objects or personnel within the city at that time are lost.
The size of the area accessible via SCP-XXX is not known; exploration teams have been able to send telegrams to ████████ in England, and receive responses.
Exiting 1875 must be done by climbing back through SCP-XXX from the outside; attempts to access SCP-XXX from within the offices of ███ ██████ reveal only an ordinary window. Exploration teams are advised that the Chicago Police in 1875 react with hostility towards the use of grappling guns and rope ladders to re-enter SCP-XXX; since all changes are eliminated at the reset, the use of lethal force is fully sanctioned with no risk to the timeline.
Items extracted from SCP-XXX are to be considered potential biohazards and contained as such.