Has Anyone Figured Out If This Is Actually Genuine?

Has anyone figured if this recording of Queen Live in Glasgow December 15th, 1975, is actually genuine?
Because the quality is very inconsistent, and some gaps might be filled with a completely other show.

Maybe it's a Royal Family production?
www.youtube.com/watch?v=8VrBV-fxjpU&list=PLohHpSEIpwCcgCylZNQ1m_3eCy7gdZ-4D&index=6

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Or Boston January 29th, 1976? Have we found the whole recording?
www.youtube.com/watch?v=s9aabd8U4qo&list=PLohHpSEIpwCcgCylZNQ1m_3eCy7gdZ-4D&index=8


Thanks!