I sometimes suspect the accuracy claimed for these cheaper scales. If they even specify an accuracy in the short instruction leaflet usually supplied.
Sometimes they claim 0.01 readability and 0.02 accuracy but I wonder how long they hold that for if they reach it at all given scales costing in the hundreds also claim similar accuracy.
Not that I'm suggesting your scales are the problem here as they are reading fine with the other bars.
I have noticed moving the coin/bar around on the few cheap scales I have often results in different readings as does leaving an item sitting on the scales for a few minutes.
I decided to register as I don't know anyone who is into coin collecting/investing, and I also need to get a better understanding of this world before I start to buy coins.
I didn't know what to call myself so I picked this pedantic name which means coins in Latin 🙄. - I know, I already regret it. Too late now.
Anyway, just wanted to say hi. I am sure I will learn a lot from all of you!
Hard to tell if it's deep enough to remove 3/4 of a gram. If it was much less in weight I'd worry but I don't think it's worth worrying about unduly.
Unless it is thicker or larger in any dimension than the other bars?
I'd just measure it and do the s.g. test to remove any niggling doubt if it's going to nag at you.
Could they have flattened/polished the rear before engraving it which might have removed a little more silver?
I think I preferred the last shillings we used to use as 5p to these. The English 3 lions and Scottish lion Royal arms ones.
Not that the putting all the coins together to make one coat of arms was that bad an idea either.