I often wonder what makes people keep certain invoices, but not others, when it comes to service history!! You'd think if his dad was their chaucer, sorry, chauffeur for 22 years, he's have got that bit right!
Looks like there's a keen bit of interest in it even though it's a non runner although i presume the front and rear bumpers would be worth a few quid - and have kept it in my watch list to see what it goes for!
There was a small piece in a recent issue of Practical Classics on the 300ce stating that it's now the best time to buy as they are on the increase. That said, mine will be up for sale soon so will be posting up a few pics in the next month or so