Without looking at other responses, id say G-4 details with some corrosion. If I were to buy this, even in this rough shape, id buy it for about 100.00 bucks due to the key date status.
Edit, if this a retooled/altered date, then it to me becomes a nearly worthless curiosity, in which it ma very well be.
Edited by mrwhatisit
03/01/2021 9:45 pm