Hello I have my grandfather's wwi calvery bridle still usable today would like some info if possible on it

Thanks for your question and your interest in the National WWI Museum and Memorial! Below is a link to our website page that references donating objects to the collection. Even if you're not seeking to donate, there is contact information for Museum and Memorial staff who can provide insight on various WWI items. Link: https://www.theworldwar.org/support/donate-object

Visiting the museum and talking to one of the many curators would be the place to start