Even with the damage, you can tell that the second coin is not a 1983 - the shape of the eight tells me that it's probably an '82.
Hope you're right with the '83. That would be an amazing find. Need to weigh it on an actual balance that reads down to 0.01 g. Rough estimates based on a known Cu coin are not 100% reliable.
Edit:

"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae
Edited by Bump111
04/01/2019 5:31 pm