Update: WWYD? Single-User Restrooms - I Dig Hardware - Answers to your door, hardware, and code questions from Allegion's Lori Greene.
Buy Vacant/In-Use & Occupied/Unoccupied Door Locks | VIZILOK™
MUTEX BLS2 Bathroom Indicator Privacy Door Knob In-Use Occupied or Vacant Nickel | eBay
Occupied/Open Bathroom Privacy Latch with Narrow Victorian Turnlatch(ZLW-43D)
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Schlage L9040-06A Privacy Mortise Lock with L283-722 Indicator
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L-100 INDICATOR
Marie 2 Pcs Toilet Door Lock, Occupied Deadbolt Indicator Lock Door Latch Bathroom WC Public Restroom Toilet Privacy Partition Door Lock Latch : Amazon.co.uk: DIY & Tools
Vacant Engaged Brass Lock Bolt Vintage Style Indicator Bathroom Toilet Door Art Deco Cinema Occupied Washroom Restroom Lavatory Fitting Room - Etsy UK
Libre-Occupé door lock toilet 70×39mm brass | Webshop