An original Jaguar handbrake ratchet friction spring part number 8840 or item 32 in the illustration.
Fits pretty much all the classic Jaguars (apart from XK's) but as always check compatibility before committing to purchase.

The item is used and does show signs of minor surface corrosion but it still in very usable condition and is an original Jaguar specification item.

You can buy aftermarket reproduction ones when they are in stock for about £6.25 or genuine ones for about £9 so if you want a used original part for the price of an aftermarket one then this might be for you