So, in Avengers: Endgame,
Stark gives Steve Rogers his shield back,
but it's
destroyed in the final battle with Thanos.
Then
at the end when he goes back to the past, he has the Stones and Mjolnir.
But
he returns as an old man with the iconic shield, which he gives to Falcon.
So, where did this shield come from?
Theories:
1. Stark made extras before he died. 2. Someone else made it or repaired it (Who? Shuri?) 3. They got it from the past?