This one is very, very good.

A die-cut trifold invitation with a die-cut paper key attached. This invitation was sent out to friends, family, and preferred clients to view a presentation of 25 new Apple products at Chateau du Lac, March 3, 1987.

The invite requests that the recipient fills out the details on the key and mails them back to Apple to reserve their place at the presentation.

This invitation is complete with the key and Apple card with a small map to the event.

An extremely rare example of early post-Steve jobs Apple marketing collateral.