O.K. ;
Here's my crappy blurry photo :
You can see the one on the left (3 1) is dull from corrosion ~ just -barely- etched , I wire brushed the crap out of it but it's kaputi I think .
Anyway , look at the difference between these and the normal ones encountered :
part # 6 of course .
Can anyone tell me what the other ones are all about ? .