Where to watch The Unknown Quantity (1919) in the UK
The Unknown Quantity (1919) is not currently listed on any UK streaming, rental, or purchase service. Last verified on 4 May 2026 by ScreenSearch.
Mary Boyne, who made shirts at four dollars a week, had no place for love in her life - only despair and hate for the son of the man who had plunged her family into deepest distress. Peter Kenwitz loved Mary, but because he was a mathematician and a pessimist by trade, his love was as hopeless as her chance for happiness.
Streaming options in the United Kingdom
Updated daily from The Movie Database. Outbound links open the provider directly.
This may be because: (a) the title hasn't been released in the UK yet, (b) it's on physical media only, or (c) the licence has temporarily lapsed. Streaming availability changes frequently — check back daily.
Last verified: — sourced from The Movie Database. Machine-readable: Markdown · JSON.
Cast & crew
Top-billed cast in The Unknown Quantity.
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Corinne GriffithMary Boyne -
Huntley GordonDan Kinsolving -
Harry DavenportSeptimus Kinsolving -
Jack McLeanSammy Boyne -
Jack RidgewayThomas Boyne
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F.R. BuckleyPeter Kenwitz
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The Unknown Quantity — frequently asked questions
Where can I watch The Unknown Quantity in the UK?
The Unknown Quantity (1919) is not currently listed by any UK streaming, rental, or purchase service in our daily-updated TMDB feed. It may be on physical media, an aggregator, or pending a UK release. Check back later — availability changes frequently.
Is The Unknown Quantity on Netflix, Disney+ or Amazon Prime Video in the UK?
The Unknown Quantity is not currently included with any major UK subscription service. It may still be available to rent or buy.
How accurate is this film's availability data?
Availability is sourced from The Movie Database (TMDB), which in turn pulls from JustWatch. Listings are refreshed daily. For purchase decisions, the provider's own site is the source of truth.
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