Can you tell from this photo? The vented area is not good - it's not awful but I'm having a fair bit of bodywork done and it's seems the right time to sort this.
I think 76 may have standard hinges, but it's possible to buy hinges from heritage to convert to the older style, I have a couple of those older style doors too
Is there something going on in the vent there @davidoft ? It's not too clear from the picture. And is the bottom edge on the outside clean, cheers?