Not all music shops are clued up, I've had bargains over the years from music shops. The cab in the picture looks like a basketweave cab, once Woogie gets the frame & cone codes we can be sure. If it's a basketweave cab with original speakers, they will be pre-rola greenbacks which in full working condition should fetch at least £100 per speaker - many people pay a premium for a matched set too.
One of my best music shop deals only around 4 years ago was a White/Matamp full stack for £250. The 4x12s had 50w purple-back Fanes and the head was sold as dead because the HT fuse-holder had arced. £0.99 later and a trip to Maplins, the amp was up and running fine complete with the original Mullard ECC83s and EL34s.
I also got a Fender Tonemaster from a shop in Newcastle for £280 because the tolex was scuffed down the side.
Another sold as dead amp for £50 was a Sound City L100. The mains switch was just broken and the amp worked fine once it was replaced.
Got an old Matamp 4x12 with 50w Celestion G12Ms for £100, that was a fantastic cab.
Maybe the shops in Manchester are more clued up. For many shops, an old Marshall 4x12 is just that - old, battered and worth a fraction of a new one.
