Mark III Green versus Blue Stripe (SNs within 700 units)

[Texas]

Good morning,

I have two long heads, reverb, simulclass, graphic -- one is a chassis date of 4/89 and SN 24,7xx and the other 7/89 SN 25,4xx. Both are a pretty close, completely ambiguous shade of blue green stripe.

I am pretty sure the 4/89 is a blue stripe (on another forum someone confirmed triode wiring on the outer power tube sockets), but I am not sure about the 7/89 amp. Based on serial number I believe the latter should be green stripe. Has anyone encountered known blue and green stripes really looking like the same stripe?

In case useful, here are pics of the 7/89 power tube sockets. Are you able to tell whether this is pentode wiring?

Thanks!

https://www.thegearpage.net/board/i...-594a-41d0-bbff-f9ad79821029-jpeg.236584/full
https://www.thegearpage.net/board/i...-9787-4efe-90cc-ee1696ad82e2-jpeg.236588/full
https://www.thegearpage.net/board/i...-3e62-46c9-a676-c477338890d8-jpeg.236589/full

 

[Texas]

I now have confirmation from Mesa that the pictured wiring is indeed pentode on the outer sockets and that the 7/89 amp is a green stripe. Pics were necessary to determine (serial number alone was not determinative).