Help With Confirming Penny Red Plate Number

I've now got the SG GB volume 1 Queen Victoria so am starting to try and identify the plate numbers on my 1d's

This is my first attempt and I'm hoping I'm correct in saying Plate 94 but I need an expert's opinion. Someone with better eyesight than me...

This is on a very nice envelope that is postmarked May 29 1849

It's also a stamp that has been cut showing the One Penny of the stamp above.

If it's not 94 back to the drawing board

Thank you.