Strange plexy

Hello, I just wanted to know why my 5513 get this strange plexy :

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It is original ?
Do I have to find a tropic 19 ??

Thank you, Jason Spring

Perhaps it's from a 1680? :grb:

But they don t look the same as you can see :

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For a 1968 5513, which plexy do I have to find ?

Sorry, the picture :

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I'm afraid I'm not precisely sure, but perhaps one of our vintage experts can chime in...Ed? Mike? :grb:

Looks like a plexy for a 1680 indeed - but without the cyclops :D

Yes, a tropic 19 would be correct - a 1968 5513 goes with a superdomed one I guess :D :D :D