Here is a great piece of F1 memorabilia. This commemorative helmet of the 2017 Canadian GP has been signed by all 20 drivers:
Lewis Hamilton
Valtteri Bottas
Kimi Raikkonen
Max Verstappen
Daniel Ricciardo
Felipe Massa
Sergio Perez
Esteban Ocon
Nico Hulkenber
Daniil Kvyat
Fernando Alonso
Carlos Sainz Jr
Romain Grosjean
Jolyon Palmer
Stoffel Vandoorne
Lance Stroll
Kevin Magnussen
Marcus Ericsson
Pascal Wehrlein
