Kyuutei Kajishi no Shiawase na Nichijou ~Black na Shokuba wo Tsuihou Saretaga, Ringoku de Koushaku Reijou ni Dekiaisarenagara White na Seikatsu Okuri…

[MangaDex]

 

[Darkenning]

Wow. So this what it's like to watch a complete narcissist start the process by which they destroy themselves. I mean, you hear about it happening, but you never think you'll get to sit back and watch.

 

[Toastility]

Wait... They really never checked his work? Did they only check at the beginning?

 

[Lunasol]

"Lucky guys are everywhere, and now that's me."

No, That isn't luck. You are just lazy bastard.

Fake is a hard-working yet VERY worthy blacksmith unlike you bloodsucking moron.

 

[merce6]

They're fucked up real bad

 

[Kingdo]

Wait... They really never checked his work? Did they only check at the beginning?

From the novel, they check his work when he arrives and few times after, but he was so overworked each time that he couldn't do much due to lack of sleep.
In the novel, he said that "he passed out after taking the hammer"

As for the enchantment, basically it's explained that people can see enchantment based on skill, if the work is too low or too high level it feels dizzy to look at. They obviously assume an apprentice work couldn't be better than them.

 

[Otherworlder]

If Beardo is the son of a count, however low his birth-order, doesn't that imply that he's still higher up in social standing than a knight, even the captain of the knights? Him being noble-born also explains how he's so clueless about other places to work as a blacksmith. We know that he is aware that they exist, or tearing up the MC's license wouldn't mean much. It's more like other forges beyond the crown's or some knight or noble's are just beneath his notice.

if the work is too low or too high level it feels dizzy to look at

While I want to say that this makes sense if you think about very low level enchantment as being done with handwriting so bad you can't read it, and very high level as being akin to uncommented code written by a talented programmer that's completely beyond your understanding, but I think that might be giving the author too much credit.