Topic: NES Blackjack

Hello everyone, I have a question, my copy of this game has squared edges on both sides of the top of the cartridge. All the copies I’ve seen online have one rounded edge. Was this a later release in the production or something?

Thanks

It's one of those unlicensed games, so (outside of the Tengen games, which this isn't one of them) few people have probably even seen the game.
I'm guessing the not-Tengen unlicensed publishers probably sourced their cartridge shells from the same or similar source since I recall they looked similar. So who knows about the consistency.