is this likely to be worth anything to someone?

If you're not bothered about preserving what's on the tape, you could try recording over part of it then trying to play it back. There's always a chance the tape is blank.
 
"And to you my son I'm going to tell you the location of the gold bullion I buried its in...testing, testing for OCUK, is this thing working??...I hope you find it and it make all your dreams come true"
 
So the amp appears to work. Have you tried taking out the plug from the "ext speaker" socket when trying play back?

good catch! Taking out just gives a tone. Seems to be present at all random test points on the tape. Shouldn't it be white noise if empty?
 
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