Aye, I checked yer linky for the amp- I'm amazed that people chuck away this stuff- how long does it take to get info on the net, check selling prices on eBay.
I too have heard of these 'Beetles' you speak of, bit of a flash in the pan, wasn't they??
In all seriousness, if there's even an outside chance of that amp being in any way associated with t'Quarrymen, it's worth chasing up- my brother is into vintage Marshalls, was able to verify the Hendrix amp that's worth around a half million (but sadly not his!!)- I know he haunts a few vintage amp forums (sad, in't it- spending hours on the web talking bollocks about old bits of tat
Anyway, I've had a hard day's night, so I'll let it be..........
_________________Yer Power b'roight Weak, Old Maan- Oi'll tek yon Loightzaber an' Stick it Up Thy Bum!
If only they had let Dave Prowse do the voice.......
...............buy my old tat!!