What's the deal with this Musicmaster?

Sparks

Why would a 1978 have a Custom Shop sticker?

https://www.ebay.co.uk/itm/404786017249

Neil

Why indeed? 

ICBM

It wouldn’t.

The neck, the tuners, the neckplate and probably the body are genuine, but nothing else is.

Replaced pickup, pickguard, bridge, body drilled through, refinished, and even the string tree has been replaced.

Optimistic price.

Funkfingers

Meanwhile, further down the eBay listing page, amongst the other items that their algorithm calculates might be of interest, is a Squier Hello Kitty STRAT for £550. It's a very, very mad world.

lustycourtier

Funkfingers said:

Meanwhile, further down the eBay listing page, amongst the other items that their algorithm calculates might be of interest, is a Squier Hello Kitty STRAT for £550. It's a very, very mad world.

Thats cheap for one. 

Offset

"Bought off a member of the public"

That's a red flag for me