100x70cm is a standard (ish) size - I think it might have been used for film posters? - so depending on how much the frame overlaps the picture area you might be able to use one of those.
Great! After a better investigation: Frame is fine, acrylic needs replacing.
Standards sizing is good to know. Thanks
@Chalfie started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
100x70cm is a standard (ish) size - I think it might have been used for film posters? - so depending on how much the frame overlaps the picture area you might be able to use one of those.